Implications of bond disorder in a S=1 kagome lattice
| Autor: | Bruce C. Noll, Stephen J. Blundell, Fan Xiao, Tom Lancaster, Robert Williams, Francis L. Pratt, Charles F. Campana, Craig V. Topping, Junjie Liu, Francesca Foronda, Jamie Brambleby, Stewart J. Clark, Christopher Baines, Jamie L. Manson, Paul Goddard, I. O. Thomas, John Singleton, Peter M. Spurgeon, Jacqueline A. Villa, Saman Ghannadzadeh |
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| Rok vydání: | 2017 |
| Předmět: |
Physics
Multidisciplinary Hydrogen bond media_common.quotation_subject TK lcsh:R Rotational symmetry Frustration lcsh:Medicine 010402 general chemistry 01 natural sciences Inductive coupling Article 0104 chemical sciences Ion Superexchange Chemical physics Lattice (order) 0103 physical sciences Antiferromagnetism lcsh:Q 010306 general physics lcsh:Science QC media_common |
| Zdroj: | Scientific Reports Scientific reports, 2018, Vol.8(1), pp.4745 [Peer Reviewed Journal] Scientific Reports, Vol 8, Iss 1, Pp 1-11 (2018) |
| ISSN: | 2045-2322 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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