Implications of bond disorder in a S=1 kagome lattice

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

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.

Citation

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

• Journal Article Type: Article
• Acceptance Date: Mar 2, 2018
• Online Publication Date: Mar 16, 2018
• Publication Date: Mar 16, 2018
• Deposit Date: Mar 19, 2018
• Publicly Available Date: Mar 23, 2018
• Journal: Scientific Reports
• Publisher: Nature Research
• Peer Reviewed: Peer Reviewed
• Volume: 8
• Issue: 1
• Article Number: 4745
• DOI: https://doi.org/10.1038/s41598-018-23054-6
• Public URL: https://durham-repository.worktribe.com/output/1364322