Anion effects on electronic structure and electrodynamic properties of the Mott insulator κ-(BEDT-TTF)2Ag2(CN)3

Pinterić, M. and Lazić, P. and Pustogow, A. and Ivek, T. and Kuveždić, Marko and Milat, Ognjen and Gumhalter, Branko and Basletić, Mario and Čulo, Matija and Korin-Hamzić, Bojana and Lohle, A. and Hubner, R. and Sanz Alonso, M. and Hiramatsu, T. and Yoshida, Y. and Saito, G. and Dressel, M. and Tomić, S. (2016) Anion effects on electronic structure and electrodynamic properties of the Mott insulator κ-(BEDT-TTF)2Ag2(CN)3. Physical Review B, 94 (16). pp. 161105-6. ISSN 1098-0121

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The Mott insulator κ-(BEDT-TTF)2Ag2(CN)3 forms a highly-frustrated triangular lattice of S = 1/2 dimers with a possible quantum-spin-liquid state. Our experimental and numerical studies reveal the emergence of a slight charge imbalance between crystallographically inequivalent sites, relaxor dielectric response, and hopping dc transport. In a broader perspective we conclude that the universal properties of strongly-correlated charge-transfer salts with spin liquid state are an anion-supported valence band and cyanide-induced quasidegenerate electronic configurations in the relaxed state. The generic low-energy excitations are caused by charged domain walls rather than by fluctuating electric dipoles. They give rise to glassy dynamics characteristic of dimerized Mott insulators, including the sibling compound κ-(BEDT-TTF)2Cu2(CN)3.

Item Type: Article
Date: 4 October 2016
Subjects: NATURAL SCIENCES > Physics
Additional Information: © 2016 American Physical Society. Received 19 July 2016; revised manuscript received 15 September 2016; published 4 October 2016.
Divisions: Faculty of Science > Department of Physics
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 29 Nov 2016 20:02
Last Modified: 29 Nov 2017 16:37

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