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Implications of bond disorder in a S=1 kagome lattice.

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

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.

Item Type:Article
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1038/s41598-018-23054-6
Publisher statement:This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
Date accepted:02 March 2018
Date deposited:23 March 2018
Date of first online publication:16 March 2018
Date first made open access:23 March 2018

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