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Durham University

Department of Physics

Staff profile

Publication details for Professor Tom Lancaster

Manson, Jamie L., Brambleby, Jamie, Goddard, Paul A., Spurgeon, Peter M., Villa, Jacqueline A., Liu, Junjie, Ghannadzadeh, Saman, Foronda, Francesca, Singleton, John, Lancaster, Tom, Clark, Stewart J., Thomas, Iorwerth O., Xiao, Fan, Williams, Robert C., Pratt, Francis L., Blundell, Stephen J., Topping, Craig V., Baines, Christopher, Campana, Charles & Noll, Bruce (2018). Implications of bond disorder in a S=1 kagome lattice. Scientific Reports 8(1): 4745.

Author(s) from Durham

Abstract

Strong hydrogen bonds such as F···H···F offer new strategies to fabricate molecular architectures exhibiting novel structures and properties. Along these lines and, to potentially realize hydrogen-bond mediated superexchange interactions in a frustrated material, we synthesized [H2F]2[Ni3F6(Fpy)12][SbF6]2 (Fpy = 3-fluoropyridine). It was found that positionally-disordered H2F+ ions link neutral NiF2(Fpy)4 moieties into a kagome lattice with perfect 3-fold rotational symmetry. Detailed magnetic investigations combined with density-functional theory (DFT) revealed weak antiferromagnetic interactions (J ~ 0.4 K) and a large positive-D of 8.3 K with ms = 0 lying below ms = ±1. The observed weak magnetic coupling is attributed to bond-disorder of the H2F+ ions which leads to disrupted Ni-F···H-F-H···F-Ni exchange pathways. Despite this result, we argue that networks such as this may be a way forward in designing tunable materials with varying degrees of frustration.