Staff profile

Responsibilities within department

Head of Condensed Matter Section

Teaching activity

Level 1: Modern Physics

Research interests

• Programming and implementing first principle and empirical computer simulations for solid state, liquid and molecular systems.
• Density functional perturbation theory.
• First principles calculation of spectroscopic measurements.
• Computer simulations of structural and vibrational properties.
• Development of new techniques to calculate excited electronic states.
• Large scale computer simulations using high performance computing.

Conference Paper

• Klarskov, P., Clark, S. J., & Jepsen, P. U. (2014). Numerical Investigation of Ultrafast interaction between THz Fields and Crystalline Materials.
• Salinero, V., Gibson, M., Brand, S., Clark, S., & Abram, R. (2005). First-principles calculations of 2x2 reconstructions of GaN surfaces. In J. Menendez, & C. VanDeWalle (Eds.),
• Clark, S., Wang, X., & Abram, R. (2005). Structural and electronic properties of HgTe quantum dots. In J. Menendez, & C. VanDeWalle (Eds.),
• Gibson, M. C., Clark, S. J., Brand, S., & Abram, R. A. (2005). Screened Exchange Calculations of Semiconductor Band Structures. In J. Menéndez, & C. G. Van de Walle (Eds.), . https://doi.org/10.1063/1.1994505
• Rushton, P., & Clark, S. (2003). Demonstrating the effectiveness of a nonlocal density functional description of exchange and correlation. In N. Gidopoulos, & S. Wilson (Eds.),
• Clark, S., Ackland, G., & Crain, J. (1998). Electronic structure calculations of liquid crystal molecules: Application to chiral solutes. In J. Rutkowska, S. Klosowicz, J. Zielinski, & J. Zmija (Eds.), . https://doi.org/10.1117/12.299962
• Adam, C., Clark, S., & Crain, J. (1998). Structure, dynamics and molecular properties of liquid crystals molecules and fragments from first principles computer simulations performed on Cray T3D. In J. Rutkowska, S. Klosowicz, J. Zielinski, & J. Zmija (Eds.), . https://doi.org/10.1117/12.299963
• Maclean, J., Hatton, P., Crain, J., Piltz, R., & Clark, S. (1996). Structural refinement and stability of silicon XII. In R. Cernik, R. Delhez, & E. Mittemeijer (Eds.),
• Hatton, P., Crain, J., Ackland, G., Clark, S., & Piltz, R. (1994). Metastable Structures Of Tetrahedral Semiconductors. In S. C. Schmidt, J. W. Shaner, G. A. Samara, & M. Ross (Eds.),

Journal Article

• Coak, M. J., Curley, S. P. M., Hawkhead, Z., Tidey, J. P., Graf, D., Clark, S. J., …Manson, J. L. (2023). Asymmetric phase diagram and dimensional crossover in a system of spin-12 dimers under applied hydrostatic pressure. Physical Review B, 108(22), Article 224431. https://doi.org/10.1103/physrevb.108.224431
• Hawkhead, Z., Hicken, T. J., Bentley, N. P., Huddart, B. M., Clark, S. J., & Lancaster, T. (2023). Band-filling-controlled magnetism from transition metal intercalation in N1/3NbS2 revealed with first-principles calculations. Physical Review Materials, 7(11), Article 114002. https://doi.org/10.1103/physrevmaterials.7.114002
• Talmantaite, A., Xie, Y., Cohen, A., Mohapatra, P., Ismach, A., Mizoguchi, T., …Mendis, B. (2023). Twist-induced interlayer charge buildup in a WS2 bilayer revealed by electron Compton scattering and density functional theory. Physical Review B, 107(23), Article 235424. https://doi.org/10.1103/physrevb.107.235424
• Huddart, B., Lancaster, T., Blundell, S., Guguchia, Z., Taniguchi, H., Clark, S., & Pratt, F. (2023). μSR investigation of magnetism in κ−(ET)2X : Antiferromagnetism. Physical Review Research, 5(1), Article 013015. https://doi.org/10.1103/physrevresearch.5.013015
• Ardimas, Pakornchote, T., Sukmas, W., Chatraphorn, S., Clark, S. J., & Bovornratanaraks, T. (2023). Phase transformations and vibrational properties of hybrid organic–inorganic perovskite MAPbI 3 bulk at high pressure. Scientific Reports, 13(1), Article 16854. https://doi.org/10.1038/s41598-023-43020-1
• Clark, S. J., & Hawkhead, Z. (2023). Non-collinear spin in electronic structure calculations. Contemporary Physics, https://doi.org/10.1080/00107514.2023.2279810
• Hicken, T., Hawkhead, Z., Wilson, M., Huddart, B., Hall, A., Balakrishnan, G., …Lancaster, T. (2022). Energy-gap driven low-temperature magnetic and transport properties in Cr1/3MS2(M = Nb, Ta). Physical Review B, 105(6), Article L060407. https://doi.org/10.1103/physrevb.105.l060407
• Younes, A., De la Flor, S., Clark, S., Nutter, J., Birkett, M., Watson, J., …Gonzalez, S. (2022). Tribological Behavior of Microalloyed Cu50Zr50 Alloy. Journal of Tribology, 144(2), Article 021706. https://doi.org/10.1115/1.4052363
• Goldie, S. J., Degiacomi, M. T., Jiang, S., Clark, S. J., Erastova, V., & Coleman, K. S. (2022). Identification of Graphene Dispersion Agents through Molecular Fingerprints. ACS Nano, 16(10), https://doi.org/10.1021/acsnano.2c04406
• Huddart, B., Onuorah, I., Isah, M., Bonfa, P., Blundell, S., Clark, S., …Lancaster, T. (2021). Intrinsic nature of spontaneous magnetic fields in superconductors with time-reversal symmetry breaking. Physical Review Letters, 127(23), Article 237002. https://doi.org/10.1103/physrevlett.127.237002
• Curley, S., Huddart, B., Kamenskyi, D., Coak, M., Williams, R., Ghannadzadeh, S., …Goddard, P. (2021). Anomalous magnetic exchange in a dimerized quantum magnet composed of unlike spin species. Physical Review B, 104(21), Article 214435. https://doi.org/10.1103/physrevb.104.214435
• Auckett, J. E., Lopez-Odriozola, L., Clark, S. J., & Radosavljevic Evans, I. (2021). Exploring the nature of the fergusonite–scheelite phase transition and ionic conductivity enhancement by Mo6+ doping in LaNbO4. Journal of Materials Chemistry A: materials for energy and sustainability, 9(7), 4091-4102. https://doi.org/10.1039/d0ta07453e
• Lu, H., Clark, S., Guo, Y., & Robertson, J. (2021). The metal–insulator phase change in vanadium dioxide and its applications. Journal of Applied Physics, 129(24), Article 240902. https://doi.org/10.1063/5.0027674
• Kaplan, A. D., Clark, S. J., Burke, K., & Perdew, J. P. (2021). Calculation and interpretation of classical turning surfaces in solids. npj Computational Materials, 7, Article 25. https://doi.org/10.1038/s41524-020-00479-0
• Friedrich, A., Collings, I. E., Dziubek, K. F., Fanetti, S., Radacki, K., Ruiz-Fuertes, J., …Marder, T. B. (2020). Pressure-Induced Polymerization of Polycyclic Arene–Perfluoroarene Cocrystals: Single Crystal X-ray Diffraction Studies, Reaction Kinetics, and Design of Columnar Hydrofluorocarbons. Journal of the American Chemical Society, 142(44), 18907-18923. https://doi.org/10.1021/jacs.0c09021
• Arh, T., Gomilšek, M., Prelovšek, P., Pregelj, M., Klanjšek, M., Ozarowski, A., …Zorko, A. (2020). Origin of Magnetic Ordering in a Structurally Perfect Quantum Kagome Antiferromagnet. Physical Review Letters, 125(2), Article 027203. https://doi.org/10.1103/physrevlett.125.027203
• Hicken, T., Holt, S., Franke, K., Hawkhead, Z., Štefančič, A., Wilson, M., …Lancaster, T. (2020). Magnetism and Néel skyrmion dynamics in GaV4S8−ySey. Physical Review Research, 2(3), Article 032001. https://doi.org/10.1103/physrevresearch.2.032001
• Lu, H., Clark, S., Guo, Y., & Robertson, J. (2020). Modelling the enthalpy change and transition temperature dependence of the metal–insulator transition in pure and doped vanadium dioxide. Physical Chemistry Chemical Physics, 22(24), 13474-13478. https://doi.org/10.1039/d0cp01929a
• Zhang, Z., Guo, Y., Lu, H., Clark, S. J., & Robertson, J. (2020). Hybrid band offset calculation for heterojunction interfaces between disparate semiconductors. Applied Physics Letters, 116(13), Article 131602. https://doi.org/10.1063/1.5135376
• Benton, C., Mitchell, C., Coleman, M., Paling, S., Lincoln, D., Thompson, L., …Gluyas, J. (2020). Optimizing geophysical muon radiography using information theory. Geophysical Journal International, 220(2), 1078-1094. https://doi.org/10.1093/gji/ggz503
• Pozina, G., Ivanov, K. A., Morozov, K. M., Girshova, E. I., Egorov, A. Y., Clark, S. J., & Kaliteevski, M. A. (2019). Enhancement of light emission in Bragg monolayer-thick quantum well structures. Scientific Reports, 9(1), Article 10162. https://doi.org/10.1038/s41598-019-46646-2
• Guo, Y., Li, H., Clark, S., & Robertson, J. (2019). Band Offset Models of Three-Dimensionally Bonded Semiconductors and Insulators. Journal of Physical Chemistry C, 123(9), 5562-5570. https://doi.org/10.1021/acs.jpcc.9b00152
• Tarekegne, A. T., Zhou, B., Kaltenecker, K., Iwaszczuk, K., Clark, S., & Jepsen, P. U. (2019). Terahertz time-domain spectroscopy of zone-folded acoustic phonons in 4H and 6H silicon carbide. Optics Express, 27(3), 3618-3628. https://doi.org/10.1364/oe.27.003618
• He, C., Shi, X., Clark, S., Li, J., Pickard, C. J., Ouyang, T., …Zhong, J. (2018). Complex Low Energy Tetrahedral Polymorphs of Group IV Elements from First Principles. Physical Review Letters, 121(17), Article 175701. https://doi.org/10.1103/physrevlett.121.175701
• Lancaster, T., Xiao, F., Huddart, B., Williams, R., Pratt, F., Blundell, S., …Krämer, K. (2018). Quantum magnetism in molecular spin ladders probed with muon-spin spectroscopy. New Journal of Physics, 20(10), Article 103002. https://doi.org/10.1088/1367-2630/aae21a
• Franke, K. J., Huddart, B. M., Hicken, T. J., Xiao, F., Blundell, S. J., Pratt, F. L., …Lancaster, T. (2018). Magnetic phases of skyrmion-hosting GaV4S8−ySey (y = 0, 2, 4, 8) probed with muon spectroscopy. Physical Review B, 98(5), Article 054428. https://doi.org/10.1103/physrevb.98.054428
• Plekhanov, E., Hasnip, P., Sacksteder, V., Probert, M., Clark, S. J., Refson, K., & Weber, C. (2018). Many-body renormalization of forces in f-electron materials. Physical review B, 98(7), Article 075129. https://doi.org/10.1103/physrevb.98.075129
• Jacquet, A., Geatches, D. L., Clark, S. J., & Greenwell, H. C. (2018). Understanding cationic polymer adsorption on mineral surfaces: kaolinite in cement aggregates. Minerals, 8(4), Article 130. https://doi.org/10.3390/min8040130
• Manson, J. L., Brambleby, J., Goddard, P. A., Spurgeon, P. M., Villa, J. A., Liu, J., …Noll, B. (2018). Implications of bond disorder in a S=1 kagome lattice. Scientific Reports, 8(1), Article 4745. https://doi.org/10.1038/s41598-018-23054-6
• Schoonmaker, R., Lancaster, T., & Clark, S. (2018). Quantum mechanical tunneling in the automerization of cyclobutadiene. The Journal of Chemical Physics, 148(10), Article 104109. https://doi.org/10.1063/1.5019254
• Clark, S. J., Hollins, T. W., Refson, K., & Gidopoulos, N. I. (2017). Self-interaction free local exchange potentials applied to metallic systems. Journal of Physics: Condensed Matter, 29(37), Article 374002. https://doi.org/10.1088/1361-648x/aa7ba6
• Thomas, I., Clark, S., & Lancaster, T. (2017). Exchange constants in molecule-based magnets derived from density functional methods. Physical Review B, 96(9), Article 094403. https://doi.org/10.1103/physrevb.96.094403
• Ivanov, K., Girshova, E., Kaliteevski, M., CLark, S., & Gallant, A. (2016). Anharmonic Bloch oscillations of electrons in electrically biased superlattices. Semiconductors, 50(11), 1463-1468. https://doi.org/10.1134/s1063782616110117
• Lancaster, T., Xiao, F., Salman, Z., Thomas, I., Blundell, S., Pratt, F., …Hesjedal, T. (2016). Transverse field muon-spin rotation measurement of the topological anomaly in a thin film of MnSi. Physical Review B, 93(14), Article 140412(R). https://doi.org/10.1103/physrevb.93.140412
• Lejaeghere, K., Bihlmayer, G., Bjoerkman, T., Blaha, P., Bluegel, S., Blum, V., …Cottenier, S. (2016). Reproducibility in density functional theory calculations of solids. Science, 351(6280), Article aad3000. https://doi.org/10.1126/science.aad3000
• Grégoire, B., Erastova, V., Geatches, D. L., Clark, S. J., Greenwell, H. C., & Fraser, D. G. (2016). Insights into the Behaviour of Biomolecules on the Early Earth: The Concentration of Aspartate by Layered Double Hydroxide Minerals. Geochimica et Cosmochimica Acta, 176, 239-258. https://doi.org/10.1016/j.gca.2015.12.026
• Williams, R., Xiao, F., Thomas, I., Clark, S., Lancaster, T., Cornish, G., …Jansen, M. (2016). Muon-spin relaxation study of the double perovskite insulators Sr2 BOsO6 (B  =  Fe, Y, ln). Journal of Physics: Condensed Matter, 28(7), Article 076001. https://doi.org/10.1088/0953-8984/28/7/076001
• Pozina, G., Kaliteevski, M., Nikitina, E., Denisov, D., Polyakov, N., Pirogov, E., …Clark, S. (2015). Super-radiant mode in InAs-monolayer-based Bragg structures. Scientific Reports, 5, Article 14911. https://doi.org/10.1038/srep14911
• Lancaster, T., Williams, R., Thomas, I., Xiao, F., Pratt, F., Blundell, S., …Balakrishnan, G. (2015). Transverse field muon-spin rotation signature of the skyrmion-lattice phase in Cu2OSeO3. Physical review B, 91(22), Article 224408. https://doi.org/10.1103/physrevb.91.224408
• Guo, Y., Robertson, J., & Clark, S. J. (2015). The effects of screening length in the non-local screened-exchange functional. Journal of Physics: Condensed Matter, 27(2), Article 025501. https://doi.org/10.1088/0953-8984/27/2/025501
• Ali, N., Williams, R., Xiao, F., Clark, S., Lancaster, T., Blundell, S., …Jansen, M. (2015). Magnetostructural relationship in the tetrahedral spin-chain oxide CsCoO2. Physical review B, 91(2), Article 024419. https://doi.org/10.1103/physrevb.91.024419
• Hasnip, P. J., Refson, K., Probert, M. I., Yates, J. R., Clark, S. J., & Pickard, C. J. (2014). Density functional theory in the solid state. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 372(2011), Article 20130270. https://doi.org/10.1098/rsta.2013.0270
• Guo, Y., Clark, S. J., & Robertson, J. (2014). Calculation of metallic and insulating phases of V2O3 by hybrid density functionals. The Journal of Chemical Physics, 140(5), Article 054702. https://doi.org/10.1063/1.4863325
• Gillen, R., Clark, S., & Robertson, J. (2013). Nature of the electronic band gap in lanthanide oxides. Physical review B, 87(12), Article 125116. https://doi.org/10.1103/physrevb.87.125116
• Tuxworth, A. J., McCabe, E. E., Free, D. G., Clark, S. J., & Evans, J. S. (2013). Structural Characterization and Physical Properties of the New Transition Metal Oxyselenide La2O2ZnSe2. Inorganic Chemistry, 52(4), 2078-2085. https://doi.org/10.1021/ic302484x
• Whale, T. F., Clark, S. J., Finney, J. L., & Salzmann, C. G. (2013). DFT-assisted interpretation of the Raman spectra of hydrogen-ordered ice XV. Journal of Raman Spectroscopy, 44(2), 290-298. https://doi.org/10.1002/jrs.4170
• Geatches, D. L., Clark, S. J., & Greenwell, H. C. (2013). DFT+U investigation of the catalytic properties of ferruginous clay. American Mineralogist, 98(1), 132-140. https://doi.org/10.2138/am.2013.4204
• Hunt, M., & Clark, S. (2012). Extraordinarily Long-Ranged Structural Relaxation in Defective Achiral Carbon Nanotubes. Physical Review Letters, 109(26), Article 265502. https://doi.org/10.1103/physrevlett.109.265502
• Gillen, R., Robertson, J., & Clark, S. (2012). Electron spin resonance signature of the oxygen vacancy in HfO2. Applied Physics Letters, 101(10), Article 102904. https://doi.org/10.1063/1.4751110
• Tulip, P., Bates, S., & Clark, S. (2012). The high-pressure electronic structure of the [Ni(ptdt)2] organic molecular conductor. The Journal of Chemical Physics, 137(2), Article 024701. https://doi.org/10.1063/1.4731692
• Guo, Y., Clark, S. J., & Robertson, J. (2012). Electronic and magnetic properties of Ti2O3, Cr2O3, and Fe2O3 calculated by the screened exchange hybrid density functional. Journal of Physics: Condensed Matter, 24(32), Article 325504. https://doi.org/10.1088/0953-8984/24/32/325504
• Robertson, J., Gillen, R., & Clark, S. (2012). Advances in understanding of transparent conducting oxides. Thin Solid Films, 520(10, SI), 3714-3720. https://doi.org/10.1016/j.tsf.2011.10.063
• Geatches, D., Clark, S., & Greenwell, H. (2012). Iron reduction in nontronite-type clay minerals: Modelling a complex system. Geochimica et Cosmochimica Acta, 81, 13-27. https://doi.org/10.1016/j.gca.2011.12.013
• Geatches, D. L., Jacquet, A., Clark, S. J., & Greenwell, H. C. (2012). Monomer Adsorption on Kaolinite: Modeling the Essential Ingredients. Journal of Physical Chemistry C, 116(42), 22365-22374. https://doi.org/10.1021/jp306371m
• Apperley, D. C., Batsanov, A. S., Clark, S. J., Harris, R. K., Hodgkinson, P., & Jochym, D. B. (2012). Computation of magnetic shielding to simultaneously validate a crystal structure and assign a solid-state NMR spectrum. Journal of Molecular Structure, 1015, 192-201. https://doi.org/10.1016/j.molstruc.2011.10.024
• Hollins, T., Clark, S., Refson, K., & Gidopoulos, N. (2012). Optimized effective potential using the Hylleraas variational method. Physical review B, 85(23), Article 235126. https://doi.org/10.1103/physrevb.85.235126
• Lee, H., Clark, S. J., & Robertson, J. (2012). Calculation of point defects in rutile TiO2 by the screened-exchange hybrid functional. Physical review B, 86(7), Article 075209. https://doi.org/10.1103/physrevb.86.075209
• Lin, L., Robertson, J., & Clark, S. (2011). Shifting Schottky barrier heights with ultra-thin dielectric layers. Microelectronic Engineering, 88(7), 1461-1463. https://doi.org/10.1016/j.mee.2011.03.049
• Clark, S., Lin, L., & Robertson, J. (2011). On the identification of the oxygen vacancy in HfO(2). Microelectronic Engineering, 88(7), 1464-1466. https://doi.org/10.1016/j.mee.2011.03.078
• Clark, S., Herbert, A., Uhrin, D., Hakobyan, S., Morgan, B., Bishop, P., & Day, A. (2011). Characterisation of the GAG-binding properties of complement factor H, an immune regulator associated with AMD. International Journal of Experimental Pathology, 92(3), A37-A38
• Geatches, D., Greenwell, H., & Clark, S. (2011). Ab initio transition state searching in complex systems: Fatty acid decarboxylation in minerals. The Journal of Physical Chemistry A, 115(12), 2658-2667. https://doi.org/10.1021/jp200106x
• Clark, S., & Robertson, J. (2011). Calculation of semiconductor band structures and defects by the screened exchange density functional. physica status solidi (b) – basic solid state physics, 248(3), 537-546. https://doi.org/10.1002/pssb.201046110
• Clark, S. J., Jouanna, P., Haines, J., & Mainprice, D. (2011). Calculation of infrared and Raman vibration modes of magnesite at high pressure by density-functional perturbation theory and comparison with experiments. Physics and Chemistry of Minerals, 38(3), 193-202. https://doi.org/10.1007/s00269-010-0395-y
• Robertson, J., & Clark, S. (2011). Limits to doping in oxides. Physical review B, 83(7), Article 075205. https://doi.org/10.1103/physrevb.83.075205
• Tan, O., Clark, S., Szablewski, M., & Cross, G. (2010). Understanding the optical spectroscopy of amphiphilic molecular rectifiers: A density functional approach. The Journal of Chemical Physics, 133(24), Article 244702. https://doi.org/10.1063/1.3516177
• Khan, G. G., Clark, S., & Bandyopadhyay, N. (2010). ELECTRONIC, MECHANICAL AND OPTICAL PROPERTIES OF Si(3)P(4) AND Ge(3)P(4): AN AB INITIO STUDY. International Journal of Modern Physics B, 24(28), 5487-5494. https://doi.org/10.1142/s0217979210055354
• Clark, S., Robertson, J., Lany, S., & Zunger, A. (2010). Intrinsic defects in ZnO calculated by screened exchange and hybrid density functionals. Physical review B, 81(11), Article 115311. https://doi.org/10.1103/physrevb.81.115311
• Liu, D., Clark, S., & Robertson, J. (2010). Oxygen vacancy levels and electron transport in Al(2)O(3). Applied Physics Letters, 96(3), Article 032905. https://doi.org/10.1063/1.3293440
• Clark, S. J., & Robertson, J. (2010). Screened exchange density functional applied to solids. Physical review B, 82(8), Article 085208. https://doi.org/10.1103/physrevb.82.085208
• Milman, V., Refson, K., Clark, S., Pickard, C., Yates, J., Gao, S. -., …Segall, M. (2010). Electron and vibrational spectroscopies using DFT, plane waves and pseudopotentials: CASTEP implementation. Journal of molecular structure. Theochem, 954(1-3, SI), 22-35. https://doi.org/10.1016/j.theochem.2009.12.040
• Geatches, D. L., Clark, S. J., & Greenwell, H. C. (2010). Role of Clay Minerals in Oil-Forming Reactions. The Journal of Physical Chemistry A, 114(10), 3569-3575. https://doi.org/10.1021/jp9096869
• Gremaud, R., Lodziana, Z., Hug, P., Willenberg, B., Racu, A., Schoenes, J., …Borgschulte, A. (2009). Evidence for hydrogen transport in deuterated LiBH(4) from low-temperature Raman-scattering measurements and first-principles calculations. Physical review B, 80(10), Article 100301. https://doi.org/10.1103/physrevb.80.100301
• Clark, S., & Robertson, J. (2009). Energy levels of oxygen vacancies in BiFeO(3) by screened exchange. Applied Physics Letters, 94(2), Article 022902. https://doi.org/10.1063/1.3070532
• Milman, V., Perlov, A., Refson, K., Clark, S. J., Gavartin, J., & Winkler, B. (2009). Structural, electronic and vibrational properties of tetragonal zirconia under pressure: a density functional theory study. Journal of Physics: Condensed Matter, 21(48), Article 485404. https://doi.org/10.1088/0953-8984/21/48/485404
• Hintschich, S. I., Rothe, C., King, S. M., Clark, S. J., & Monkman, A. P. (2008). The Complex Excited-state Behavior of a Polyspirobifluorene Derivative: The Role of Spiroconjugation and Mixed Charge Transfer Character on Excited-state Stabilization and Radiative Lifetime. Journal of Physical Chemistry B (Soft Condensed Matter and Biophysical Chemistry), 112(51), 16300-16306. https://doi.org/10.1021/jp8044884
• Jones, P. A., Archer, T. K., Baylin, S. B., Beck, S., Berger, S., Bernstein, B. E., …Excellence, E. U. N. (2008). Moving AHEAD with an international human epigenome project. Nature, 454(7205), 711-715. https://doi.org/10.1038/454711a
• Palai, R., Katiyar, R., Schmid, H., Tissot, P., Clark, S., Robertson, J., …Scott, J. (2008). β phase and γ-β metal-insulator transition in multiferroic BiFeO3. Physical review B, 77(1), Article 014110. https://doi.org/10.1103/physrevb.77.014110
• Xiong, K., Robertson, J., & Clark, S. (2008). Electronic defects in LaAlO3. Microelectronic Engineering, 85(1, SI), 65-69. https://doi.org/10.1016/j.mee.2007.01.181
• Soleilhavoup, A., Hampson, M. R., Clark, S. J., Evans, J. S., & Hodgkinson, P. (2007). Using O-17 solid-state NMR and first principles calculation to characterise structure and dynamics in inorganic framework materials. Magnetic Resonance in Chemistry, 45(S), S144-S155. https://doi.org/10.1002/mrc.2128
• Xiong, K., Robertson, J., & Clark, S. (2007). Behavior of hydrogen in wide band gap oxides. Journal of Applied Physics, 102(8), Article 083710. https://doi.org/10.1063/1.2798910
• Jochym, D. B., & Clark, S. J. (2007). Exchange-correlation holes in metal surfaces using nonlocal density-functional theory. Physical review B, 76(7), Article 075411. https://doi.org/10.1103/physrevb.76.075411
• Clark, S., & Robertson, J. (2007). Band gap and Schottky barrier heights of multiferroic BiFeO3. Applied Physics Letters, 90(13), Article 132903. https://doi.org/10.1063/1.2716868
• Zheng, G., Clark, S., Brand, S., & Abram, R. (2007). Non-local density functional description of poly-para-phenylene vinylene. Chinese Physics Letters, 24(3), 807-810. https://doi.org/10.1088/0256-307x/24/3/061
• Geary, E. A., Yellowlees, L. J., Parsons, S., Pilia, L., Serpe, A., Mercuri, M. L., …Robertson, N. (2007). Influence of the R-substituents on the properties of [Ni(R(2)pipdt)(dmit)] complexes and crystal structure where R = CH2C6H5. Dalton Transactions, 5453-5459. https://doi.org/10.1039/b712243h
• Hinshelwood, R. A., Huschtscha, L. I., Melki, J., Stirzaker, C., Abdipranoto, A., Vissel, B., …Clark, S. J. (2007). Concordant epigenetic silencing of transforming growth factor-beta signaling pathway genes occurs early in breast carcinogenesis. Cancer Research, 67(24), 11517-11527. https://doi.org/10.1158/0008-5472.can-07-1284
• Jepsen, P. U., & Clark, S. J. (2007). Precise ab-initio prediction of terahertz vibrational modes in crystalline systems. Chemical Physics Letters, 442(4-6), 275-280. https://doi.org/10.1016/j.cplett.2007.05.112
• Lee, J. M., Davis, M. M., Clark, S. J., & Kemper, A. R. (2007). Threshold of evaluation for short stature in a pediatric endocrine clinic: Differences between boys versus girls?
• Robbins, A., Ng, W., Jochym, D., Keal, T., Clark, S., Tozer, D., & Hodgkinson, P. (2007). Combining insights from solid-state NMR and first principles calculation: applications to the ¹⁹F NMR of octafluoronaphthalene. Physical Chemistry Chemical Physics, 9(19), 2389-2396. https://doi.org/10.1039/b701291h
• Kemper, A. R., & Clark, S. J. (2007). Preschool vision screening by family physicians
• Kemper, A. R., Uren, R. L., Moseley, K. L., & Clark, S. J. (2006). Primary care physicians' attitudes regarding follow-up care for children with positive newborn screening results. Pediatrics, 118(5), 1836-1841. https://doi.org/10.1542/peds.2006-1639
• Heaton, R. J., Madden, P. A., Clark, S. J., & Jahn, S. (2006). Condensed phase ionic polarizabilities from plane wave density functional theory calculations. The Journal of Chemical Physics, 125(14), Article 144104. https://doi.org/10.1063/1.2357151
• Zheng, G., Clark, S., Brand, S., & Abram, R. (2006). Lattice dynamics of polyaniline and poly(p-pyridyl vinyline): First-principles determination. Physical review B, 74(16), https://doi.org/10.1103/physrevb.74.165210
• Kemper, A. R., Uren, R. L., & Clark, S. J. (2006). Barriers to follow-up eye care after preschool vision screening in the primary care setting: Findings from a pilot study. Journal of AAPOS, 10(5), 476-478. https://doi.org/10.1016/j.jaapos.2006.07.009
• Tulip, P., & Clark, S. (2006). Lattice dynamical and dielectric properties of L-amino acids. Physical review B, 74(6), Article 064301. https://doi.org/10.1103/physrevb.74.064301
• McGregor, P. A., Allan, D. R., Parsons, S., & Clark, S. J. (2006). Hexamer formation in tertiary butyl alcohol (2-methyl-2-propanol, C4H10O). Acta crystallographica. Section B, Structural science, 62(Part 4), 599-605. https://doi.org/10.1107/s0108768106015424
• Xiong, K., Robertson, J., & Clark, S. (2006). Defect states in the high-dielectric-constant gate oxide LaAlO3. Applied Physics Letters, 89(2), Article 022907. https://doi.org/10.1063/1.2221521
• Xiong, K., Robertson, J., & Clark, S. (2006). Defect energy states in high-K gate oxides. physica status solidi (b) – basic solid state physics, 243(9), 2071-2080. https://doi.org/10.1002/pssb.200666803
• Robertson, J., Xiong, K., & Clark, S. (2006). Band structure of functional oxides by screened exchange and the weighted density approximation. physica status solidi (b) – basic solid state physics, 243(9), 2054-2070. https://doi.org/10.1002/pssb.200666802
• Kemper, A., Uren, R., & Clark, S. (2006). Adoption of electronic health records in primary care pediatric practices. Pediatrics, 118(1), E20-E24. https://doi.org/10.1542/peds.2005-3000
• Timon, V., Brand, S., Clark, S., & Abram, R. (2006). Molecular dynamics calculations of the thermal expansion properties and melting points of Si and Ge. Journal of Physics: Condensed Matter, 18(13), 3489-3498. https://doi.org/10.1088/0953-8984/18/13/016
• Moggach, S., Allan, D., Clark, S., Gutmann, M., Parsons, S., Pulham, C., & Sawyer, L. (2006). High-pressure polymorphism in L-cysteine: the crystal structures of L-cysteine-III and L-cysteine-IV. Acta crystallographica. Section B, Structural science, 62(Part 2), 296-309. https://doi.org/10.1107/s0108768105038802
• Refson, K., Tulip, P., & Clark, S. (2006). Variational density-functional perturbation theory for dielectrics and lattice dynamics. Physical review B, 73(15), Article 155114. https://doi.org/10.1103/physrevb.73.155114
• Szablewski, M., Bloor, D., Kagawa, Y., Mosurkal, R., Cole, J., Clark, S., …Palsson, L. (2006). Matrix dependence of blue light emission from a novel NH2-functionalized dicyanoquinodimethane derivative. Journal of Physical Organic Chemistry, 19(3), 206-213. https://doi.org/10.1002/poc.1020
• Gibson, M., Brand, S., & Clark, S. (2006). Screened-exchange stress tensor in density functional theory. Physical review B, 73(12), Article 125120. https://doi.org/10.1103/physrevb.73.125120
• Xiong, K., Robertson, J., & Clark, S. (2006). Passivation of oxygen vacancy states in HfO2 by nitrogen. Journal of Applied Physics, 99(4), Article 044105. https://doi.org/10.1063/1.2173688
• Gibbons, D. W., Bohan, D. A., Rothery, P., Stuart, R. C., Haughton, A. J., Scott, R. J., …Firbank, L. G. (2006). Weed seed resources for birds in fields with contrasting conventional and genetically modified herbicide-tolerant crops. Proceedings of the Royal Society B: Biological Sciences, 273(1596), 1921-1928. https://doi.org/10.1098/rspb.2006.3522
• Robertson, J., Xiong, K., & Clark, S. (2006). Band gaps and defect levels in functional oxides. Thin Solid Films, 496(1), 1-7. https://doi.org/10.1016/j.tsf.2005.08.175
• Xiong, K., Robertson, J., Gibson, M., & Clark, S. (2005). Defect energy levels in HfO2 high-dielectric-constant gate oxide. Applied Physics Letters, 87(18), Article 183505. https://doi.org/10.1063/1.2119425
• Moggach, S., Clark, S., & Parsons, S. (2005). L-cysteine-I at 30 K. Acta crystallographica. Section E, 61(Part 8), O2739-O2742. https://doi.org/10.1107/s1600536805023688
• Timon, V., Brand, S., Clark, S., Gibson, M., & Abram, R. (2005). First-principles calculations of 2x2 reconstructions of GaN(0001) surfaces involving N, Al, Ga, In, and as atoms. Physical review B, 72(3), https://doi.org/10.1103/physrevb.72.035327
• Zheng, G., Clark, S., Tulip, P., Brand, S., & Abram, R. (2005). Ab initio dynamics study of poly-para-phenylene vinylene. The Journal of Chemical Physics, 123(2), Article 024904. https://doi.org/10.1063/1.1955516
• Giblin, S., Terry, I., Clark, S., Prokscha, T., Prabhakaran, D., Boothroyd, A., …Leighton, C. (2005). Observation of magnetic excitons in LaCoO 3. European Physical Society Letters, 70(5), 677-683. https://doi.org/10.1209/epl/i2004-10519-4
• Tulip, P., & Clark, S. (2005). Structural and electronic properties of L-amino acids. Physical review B, 71(19), Article 195117. https://doi.org/10.1103/physrevb.71.195117
• Timon, V., Brand, S., Clark, S., & Abram, R. (2005). Theoretical adlayer surface morphology of wurtzite 2 × 2 reconstructions of the GaN (0001) surface. Journal of Physics: Condensed Matter, 17(1), 17-26. https://doi.org/10.1088/0953-8984/17/1/002
• Staniland, S., Fujita, W., Umezono, Y., Awaga, K., Camp, P., Clark, S., & Robertson, N. (2005). [BDTA](2)[Cu(mnt)(2)]: An almost perfect one-dimensional magnetic material. Inorganic Chemistry, 44(3), 546-551. https://doi.org/10.1021/ic04879%2B
• Chisholm, J., Motherwell, S., Tulip, P., Parsons, S., & Clark, S. (2005). An ab initio study of observed and hypothetical polymorphs of glycine. Crystal Growth and Design, 5(4), 1437-1442. https://doi.org/10.1021/cg0496235
• Clark, S., Segall, M., Pickard, C., Hasnip, P., Probert, M., Refson, K., & Payne, M. (2005). First principles methods using CASTEP. Zeitschrift für Kristallographie - Crystalline Materials, 220(5-6), 567-570. https://doi.org/10.1524/zkri.220.5.567.65075
• Staniland, S., Fujita, W., Umezono, Y., Awaga, K., Clark, S., Cui, H., …Robertson, N. (2005). A unique new multiband molecular conductor: [BDTA][Ni(dmit)(2)](2). Chemical Communications, 3204-3206. https://doi.org/10.1039/b502783g
• Dawson, A., Allan, D., Belmonte, S., Clark, S., David, W., McGregor, P., …Sawyer, L. (2005). Effect of high pressure on the crystal structures of polymorphs of glycine. Crystal Growth and Design, 5(4), 1415-1427. https://doi.org/10.1021/cg049716m
• Wang, X., Clark, S., & Abram, R. (2004). Ab initio calculations of the structural and electronic properties of HgmTen clusters. Physical review B, 70(23), Article 235328. https://doi.org/10.1103/physrevb.70.235328
• Chen, C., Lee, M., & Clark, S. (2004). Band gap modification of single-walled carbon nanotube and boron nitride nanotube under a transverse electric field. Nanotechnology, 15(12), 1837-1843. https://doi.org/10.1088/0957-4484/15/12/025
• Zheng, G., Clark, S., Brand, S., & Abram, R. (2004). First-principles studies of the structural and electronic properties of poly-para-phenylene vinylene. Journal of Physics: Condensed Matter, 16(47), 8609-8620. https://doi.org/10.1088/0953-8984/16/47/013
• Cheung, D., Clark, S., & Wilson, M. (2004). Calculation of flexoelectric coefficients for a nematic liquid crystal by atomistic simulation. The Journal of Chemical Physics, 121(18), 9131-9139. https://doi.org/10.1063/1.1802231
• Tulip, P., & Clark, S. (2004). Dielectric and vibrational properties of amino acids. The Journal of Chemical Physics, 121(11), 5201-5210. https://doi.org/10.1063/1.1781615
• Timon, V., Brand, S., Clark, S., & Abram, R. (2004). Ab initio studies of strained wurtzite GaN surfaces. Journal of Physics: Condensed Matter, 16(4), 531-542. https://doi.org/10.1088/0953-8984/16/4/002
• Chen, C., Lee, M., & Clark, S. (2004). Gas molecule effects on field emission properties of single-walled carbon nanotube. Diamond and Related Materials, 13(4-8), 1306-1313. https://doi.org/10.1016/j.diamond.2003.11.081
• Chen, C., Lee, M., & Clark, S. (2004). Field penetration induced charge redistribution effects on the field emission properties of carbon nanotubes - a first-principle study. Applied Surface Science, 228(1-4), 143-150. https://doi.org/10.1016/j.apsusc.2004.01.004
• Clark, S., & Rushton, P. (2004). Investigation on exchange and correlation holes in a strongly confined electron gas. Journal of Physics: Condensed Matter, 16(28), 4833-4844. https://doi.org/10.1088/0953-8984/16/28/006
• Smith, C., Smith, P., Thomas, R., Robins, E., Collings, J., Dai, C., …Marder, T. (2004). Arene-perfluoroarene interactions in crystal engineering: structural preferences in polyfluorinated tolans. Journal of materials chemistry, 14(3), 413-420. https://doi.org/10.1039/b314094f
• Allan, D., Clark, S., Dawson, A., McGregor, P., & Parsons, S. (2002). Pressure-induced polymorphism in phenol. Acta crystallographica. Section B, Structural science, 58(Part 6), 1018-1024. https://doi.org/10.1107/s0108768102018797
• Collings, J., Roscoe, K., Robins, E., Batsanov, A., Stimson, L., Howard, J., …Marder, T. (2002). Arene-perfluoroarene interactions in crystal engineering 8: structures of 1 : 1 complexes of hexafluorobenzene with fused-ring polyaromatic hydrocarbons. New Journal of Chemistry, 26(12), 1740-1746. https://doi.org/10.1039/b207102a
• Cheung, D., Clark, S., & Wilson, M. (2002). Parametrization and validation of a force field for liquid-crystal forming molecules. Physical review E: Statistical physics, plasmas, fluids, and related interdisciplinary topics, 65(5, Part 1), Article 051709. https://doi.org/10.1103/physreve.65.051709
• Cheung, D., Clark, S., & Wilson, M. (2002). Calculation of the rotational viscosity of a nematic liquid crystal. Chemical Physics Letters, 356(1-2), 140-146. https://doi.org/10.1016/s0009-2614%2802%2900380-9
• Allan, D., Clark, S., Dawson, A., McGregor, P., & Parsons, S. (2002). Comparison of the high-pressure and low-temperature structures of sulfuric acid. Journal of the Chemical Society. Dalton transactions (2001. Online), 1867-1871. https://doi.org/10.1039/b109395a
• Rushton, P., Tozer, D., & Clark, S. (2002). Description of exchange and correlation in the strongly inhomogeneous electron gas using a nonlocal density functional. Physical review B, 65(19), Article 193106. https://doi.org/10.1103/physrevb.65.193106
• Segall, M., Lindan, P., Probert, M., Pickard, C., Hasnip, P., Clark, S., & Payne, M. (2002). First-principles simulation: ideas, illustrations and the CASTEP code. Journal of Physics: Condensed Matter, 14(11), 2717-2744. https://doi.org/10.1088/0953-8984/14/11/301
• Rushton, P., Tozer, D., & Clark, S. (2002). Nonlocal density-functional description of exchange and correlation in silicon. Physical review B, 65(23), Article 235203. https://doi.org/10.1103/physrevb.65.235203
• Bloor, D., Kagawa, Y., Szablewski, M., Ravi, M., Clark, S., Cross, G., …Rumbles, G. (2001). Matrix dependence of light emission from TCNQ adducts. Journal of materials chemistry, 11(12), 3053-3062. https://doi.org/10.1039/b104992p
• Ackland, G., & Clark, S. (2001). Ab initio molecular dynamics of liquid carbon disulphide. Molecular Physics, 99(10), 855-863. https://doi.org/10.1080/00268970010018413
• Rushton, P., Clark, S., & Tozer, D. (2001). Density-functional calculations of semiconductor properties using a semiempirical exchange-correlation functional. Physical Review B, 63(11), Article 115206. https://doi.org/10.1103/physrevb.63.115206
• Al-Allak, H., & Clark, S. (2001). Valence-band offset of the lattice-matched beta-FeSi2(100)/Si(001) heterostructure. Physical Review B (Condensed Matter), 63(3), Article 033311. https://doi.org/10.1103/physrevb.63.033311
• King, E., Clark, S., Verdozzi, C., & Ackland, G. (2001). Interaction between metallic p orbitals and the pi orbitals of organic molecules: The binding between ethylene and aluminum. Journal of Physical Chemistry B (Soft Condensed Matter and Biophysical Chemistry), 105(3), 641-645. https://doi.org/10.1021/jp0012810
• Cronin, L., Clark, S., Parsons, S., Nakamura, T., & Robertson, N. (2001). Unique structural topologies involving metal-metal and metal-sulfur interactions: salts of [Ni(C3S5)(2)](x-) with cis-anti-cis-dicyclohexyl-18-crown-6 complexed counter ions. Journal of the Chemical Society. Dalton transactions (2001. Online), 1347-1351. https://doi.org/10.1039/b008299f
• Al-Allak, H., & Clark, S. (2001). Valence-band offset of the lattice-matched beta-FeSi(2)(100)/Si(001) heterostructure. Physical Review B (Condensed Matter), 63(3), Article 033311
• Clark, S., Markwick, P., Ackland, G., & Crain, J. (2000). Short-time reorientational processes in molecular fluids. European Physical Society Letters, 49(1), 34-40. https://doi.org/10.1209/epl/i2000-00116-1
• Allan, D., Clark, S., Parsons, S., & Ruf, M. (2000). A high-pressure structural study of propionic acid and the application of CCD detectors in high-pressure single-crystal x-ray diffraction. Journal of Physics: Condensed Matter, 12(39), L613-L620. https://doi.org/10.1088/0953-8984/12/39/101
• Clark, A., & Clark, S. (2000). Rolling-horizon lot-sizing when set-up times are sequence-dependent. International Journal of Production Research, 38(10), 2287-2307. https://doi.org/10.1080/00207540050028106
• Allan, D., Clark, S., Ibberson, R., Parsons, S., Pulham, C., & Sawyer, L. (1999). The influence of pressure and temperature on the crystal structure of acetone. Chemical Communications, 751-752. https://doi.org/10.1039/a900558g
• Allan, D., & Clark, S. (1999). Comparison of the high-pressure and low-temperature structures of ethanol and acetic acid. Physical review B, 60(9), 6328-6334. https://doi.org/10.1103/physrevb.60.6328
• Allan, D., & Clark, S. (1999). Impeded dimer formation in the high-pressure crystal structure of formic acid. Physical Review Letters, 82(17), 3464-3467. https://doi.org/10.1103/physrevlett.82.3464
• Hsueh, H., Chen, R., Vass, H., Clark, S., Ackland, G., Poon, W., & Crain, J. (1998). Compression mechanisms in quasimolecular XI(3) (X = As, Sb, Bi) solids. Physical review B, 58(22), 14812-14822. https://doi.org/10.1103/physrevb.58.14812
• Clark, S., Al-Allak, H., Brand, S., & Abram, R. (1998). Structure and electronic properties of FeSi2. Physical review B, 58(16), 10389-10393. https://doi.org/10.1103/physrevb.58.10389
• Warren, M., Ackland, G., Karki, B., & Clark, S. (1998). Phase transitions in silicate perovskites from first principles. Mineralogical Magazine, 62(5), 585-598. https://doi.org/10.1180/002646198547981
• Adam, C., Clark, S., Wilson, M., Ackland, G., & Crain, J. (1998). Transferability of first principles derived torsional potentials for mesogenic molecules and fragments. Molecular Physics, 93(6), 947-954. https://doi.org/10.1080/002689798168646
• Clark, S., Ackland, G., & Crain, J. (1998). Ab initio molecular polarisabilities of liquid crystals: Application to DOBAMBC and 5CB. European Physical Society Letters, 44(5), 578-584. https://doi.org/10.1209/epl/i1998-00512-5
• Kelsey, A., Ackland, G., & Clark, S. (1998). Stability and electronic structure of the cinnabar phase in GaAs. Physical review B, 57(4), R2029-R2032. https://doi.org/10.1103/physrevb.57.r2029
• Allan, D., Clark, S., Brugmans, M., Ackland, G., & Vos, W. (1998). Structure of crystalline methanol at high pressure. Physical Review B (Condensed Matter), 58(18), 11809-11812
• Allan, D., Kelsey, A., Clark, S., Angel, R., & Ackland, G. (1998). High-pressure semiconductor-semimetal transition in TiS2. Physical review B, 57(9), 5106-5110. https://doi.org/10.1103/physrevb.57.5106
• Adam, C., Clark, S., Ackland, G., & Crain, J. (1997). Conformation-dependent dipoles of liquid crystal molecules and fragments from first principles. Physical review E: Statistical physics, plasmas, fluids, and related interdisciplinary topics, 55(5, Part a), 5641-5649. https://doi.org/10.1103/physreve.55.5641
• Clark, S., Crain, J., & Ackland, G. (1997). Comparison of bonding in amorphous silicon and carbon. Physical review B, 55(21), 14059-14062. https://doi.org/10.1103/physrevb.55.14059
• Karki, B., Clark, S., Warren, M., Hsueh, H., Ackland, G., & Crain, J. (1997). Ab initio elasticity and lattice dynamics of AgGaSe2. Journal of Physics: Condensed Matter, 9(2), 375-380. https://doi.org/10.1088/0953-8984/9/2/005
• Ackland, G., Warren, M., & Clark, S. (1997). Practical methods in ab initio lattice dynamics. Journal of Physics: Condensed Matter, 9(37), 7861-7872. https://doi.org/10.1088/0953-8984/9/37/017
• Clark, S., Adam, C., Ackland, G., & Crain, J. (1997). Conformation energy surface for liquid crystal molecules from first principles: Application to 5CB. Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals, 299, 39-\&. https://doi.org/10.1080/10587259708041971
• Karki, B., Stixrude, L., Clark, S., Warren, M., Ackland, G., & Crain, J. (1997). Structure and elasticity of MgO at high pressure. American Mineralogist, 82(1-2), 51-60
• Clark, S., & Ackland, G. (1997). Ab initio calculations of the self-interstitial in silicon. Physical review B, 56(1), 47-50. https://doi.org/10.1103/physrevb.56.47
• Karki, B., Stixrude, L., Clark, S., Warren, M., Ackland, G., & Crain, J. (1997). Elastic properties of orthorhombic MgSiO3 perovskite at lower mantle pressures. American Mineralogist, 82(5-6), 635-638
• Clark, S., Adam, C., Hsueh, H., Pu, F., & Crain, J. (1997). Vibrational properties of liquid crystal molecules from ab initio computer simulation. Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals, 302, 433-438. https://doi.org/10.1080/10587259708041859
• Hsueh, H., Vass, H., Pu, F., Clark, S., Poon, C., & Crain, J. (1997). Low-frequency dynamics of liquid crystals. European Physical Society Letters, 38(2), 107-112. https://doi.org/10.1209/epl/i1997-00209-3
• Clark, S., Adam, C., Ackland, G., White, J., & Crain, J. (1997). Properties of liquid crystal molecules from first principles computer simulation. Liquid Crystals, 22(4), 469-475. https://doi.org/10.1080/026782997209199
• Clark, S., Adam, C., Cleaver, D., & Crain, J. (1997). Conformational energy landscapes of liquid crystal molecules. Liquid Crystals, 22(4), 477-482. https://doi.org/10.1080/026782997209207
• Freed, G., Katz, S., & Clark, S. (1996). Safety of vaccinations - Miss America, the media, and public health. Journal of the American Medical Association, 276(23), 1869-1872. https://doi.org/10.1001/jama.276.23.1869
• Hsueh, H., Warren, M., Vass, H., Ackland, G., Clark, S., & Crain, J. (1996). Vibrational properties of the layered semiconductor germanium sulfide under hydrostatic pressure: Theory and experiment. Physical review B, 53(22), 14806-14817. https://doi.org/10.1103/physrevb.53.14806
• Piltz, R., Maclean, J., Clark, S., Ackland, G., Hatton, P., & Crain, J. (1995). Structure and properties of silicon XII: A complex tetrahedrally bonded phase. Physical Review B (Condensed Matter), 52(6), 4072-4085. https://doi.org/10.1103/physrevb.52.4072
• Crain, J., Ackland, G., & Clark, S. (1995). EXOTIC STRUCTURES OF TETRAHEDRAL SEMICONDUCTORS. Reports on Progress in Physics, 58(7), 705-754. https://doi.org/10.1088/0034-4885/58/7/001
• Hsueh, H., Vass, H., Clark, S., & Crain, J. (1995). Breakdown of Rigid-Unit Vibrations in Layered Semiconductors under Pressure: Application to Germanium Sulfide. European Physical Society Letters, 31(3), 151-155. https://doi.org/10.1209/0295-5075/31/3/005
• Clark, S., Ackland, G., & Crain, J. (1995). Theoretical stability limit of diamond at ultrahigh pressure. Physical review B, 52(21), 15035-15038. https://doi.org/10.1103/physrevb.52.15035
• Hsueh, H., Vass, H., Clark, S., Ackland, G., & Crain, J. (1995). HIGH-PRESSURE EFFECTS IN THE LAYERED SEMICONDUCTOR GERMANIUM SELENIDE. Physical review B, 51(23), 16750-16760. https://doi.org/10.1103/physrevb.51.16750
• Crain, J., Ackland, G., Piltz, R., Hatton, P., & Clark, S. (1995). DENSE TETRAHEDRAL STRUCTURES OF COMPOUND SEMICONDUCTOR. Journal of Physics and Chemistry of Solids, 56(3-4), 495-500. https://doi.org/10.1016/0022-3697%2894%2900230-4
• Hsueh, H., Vass, H., Clark, S., & Crain, J. (1995). BREAKDOWN OF RIGID-UNIT VIBRATIONS IN LAYERED SEMICONDUCTORS UNDER PRESSURE - APPLICATION TO GERMANIUM SULFIDE (VOL 31, PG 151, 1995). European Physical Society Letters, 31(8), https://doi.org/10.1209/0295-5075/31/8/c01
• Clark, S., Ackland, G., & Akbarzadeh, H. (1995). A THEORETICAL-STUDY OF PRESSURE EFFECTS ON SELENIUM-I. Journal of Physics and Chemistry of Solids, 56(3-4), 329-334. https://doi.org/10.1016/0022-3697%2894%2900202-9
• Hsueh, H., Maclean, J., Guo, G., Lee, M., Clark, S., Ackland, G., & Crain, J. (1995). PRESSURE-INDUCED POLYMORPHISM IN CUCL - AN AB-INITIO STUDY. Physical review B, 51(18), 12216-12222. https://doi.org/10.1103/physrevb.51.12216
• Crain, J., Piltz, R., Ackland, G., Clark, S., Payne, M., Milman, V., …Nam, Y. (1994). Tetrahedral structures and phase transitions in III-V semiconductors. Physical Review B (Condensed Matter), 50(12), 8389-8401. https://doi.org/10.1103/physrevb.50.8389
• Clark, S., Ackland, G., Crain, J., & Payne, M. (1994). VERY-LOW ENERGY SURFACE OF SILICON. Physical review B, 50(8), 5728-5731. https://doi.org/10.1103/physrevb.50.5728
• Clark, S., Ackland, G., & Crain, J. (1994). Theoretical study of high-density phases of covalent semiconductors. II. Empirical treatment. Physical Review B (Condensed Matter), 49(8), 5341-5352. https://doi.org/10.1103/physrevb.49.5341
• Crain, J., Clark, S., Ackland, G., Payne, M., Milman, V., Hatton, P., & Reid, B. (1994). Theoretical study of high-density phases of covalent semiconductors. I. Ab initio treatment. Physical Review B (Condensed Matter), 49(8), 5329-5340. https://doi.org/10.1103/physrevb.49.5329
• Akbarzadeh, H., Clark, S., & Ackland, G. (1993). A THEORETICAL-STUDY OF SELENIUM-I UNDER HIGH-PRESSURE. Journal of Physics: Condensed Matter, 5(43), 8065-8074. https://doi.org/10.1088/0953-8984/5/43/018
• Clark, S., & Ackland, G. (1993). VIBRATIONAL AND ELASTIC EFFECTS OF POINT-DEFECTS IN SILICON. Physical review B, 48(15), 10899-10908. https://doi.org/10.1103/physrevb.48.10899
• Clark, S. (1985). THE EFFECTS OF GOVERNMENT EXPENDITURE ON THE TERM STRUCTURE OF INTEREST-RATES - COMMENT. Journal of Money, Credit and Banking, 17(3), 397-400. https://doi.org/10.2307/1992635