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Durham University

Department of Physics

Staff profile

Publication details for Professor Tom Lancaster

Mannig, A., Möller, J. S., Thede, M., Hüvonen, D., Lancaster, T., Xiao, F., Williams, R.C., Guguchia, Z., Khasanov, R., Morenzoni, E. & Zheludev, A. (2016). Effect of disorder on a pressure-induced z = 1 magnetic quantum phase transition. Physical Review B 94(14): 144418.

Author(s) from Durham


Pressure-induced ordering close to a z=1 quantum-critical point is studied in the presence of bond disorder in the quantum spin system (C4H12N2)Cu2(Cl1−xBrx)6 (PHCX) by means of muon-spin rotation and relaxation. As for the pure system (C4H12N2)Cu2Cl6, pressure allows PHCX with small levels of disorder (x≤7.5%) to be driven through a quantum-critical point separating a low-pressure quantum paramagnetic phase from magnetic order at high pressures. However, the pressure-induced ordered state is highly inhomogeneous for disorder concentrations x>1%. This behavior might be related to the formation of a quantum Griffiths phase above a critical disorder concentration 7.5%