Hall effect study of the κ -(ET) 2X family : Evidence for Mott-Anderson localization

Scientific paper - Original scientific paper

• Author: Matija Čulo; MBZ: 315094
• Author: Emil Tafra; MBZ: 248700
• Author: Bojan Mihaljević
• Author: Mario Basletić; MBZ: 197593
• Author: Marko Kuveždić; MBZ: 352683
• Author: Tomislav Ivek; MBZ: 261996
• Author: Amir Hamzić; MBZ: 15234
• Author: Silvia Tomić; MBZ: 65594
• Author: T. Hiramatsu
• Author: Y. Yoshida
• Author: G. Saito
• Author: J.A. Schlueter
• Author: M. Dressel
• Author: Bojana Korin-Hamzić
• Author's institution: University of Zagreb; Faculty of Science; (Department of Physics)
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics

Abstract (english)

We investigate the dc resistivity and Hall effect of the quasi-two-dimensional organic materials κ–(ET)2X, where X=Ag2(CN)3 and B(CN)4 and compare them with the results for X=Cu2(CN)3. All three compounds are considered to be quantum-spin-disordered Mott insulators. Despite high similarities in chemical composition and crystal structure, large differences in the dc resistivity and Hall coefficient are found. While around room temperature the dc transport properties are dominantly determined by the strength of the electron correlations, upon reducing the temperature, dc transport happens by hopping due to inherent disorder. The most disordered compound with X=Cu2(CN)3 turns out to have the lowest dc resistivity and the highest charge carrier density, i.e., in the phase diagram it is located closest to the metal-insulator transition. The least disordered compound with X=B(CN)4 shows the highest resistivity and the lowest carrier density, i.e., lies farthest from the metal-insulator transition. We explain such counterintuitive behavior within the theory of Mott-Anderson localization as a consequence of disorder-induced localized states within the correlation gap.

• Keywords (english): organic conductors; Hall effect; Mott-Anderson localization
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Published version
• Journal title: Physical Review B
• Numbering: vol. 99, no. 4, 045114
• p-ISSN: 2469-9950
• e-ISSN: 2469-9969
• DOI: https://doi.org/10.1103/physrevb.99.045114
• URN:NBN: urn:nbn:hr:217:756852
• Publication: 2019
• Project: Number: IP-2013-11-1011; Title (croatian): Jako korelirani elektroni u slojnim organskim materijalima i manganitima: niskofrekventna pobuđenja i nelinearna dinamika; Acronym: SCEinLOM; Leader: Silvia Tomić; Jurisdiction: Croatia; Funding stream: IP
• Document URL: https://journals.aps.org/prb/abstract/10.1103/PhysRevB.99.045114
• Type of resource: Text
• Access conditions: Open access
• Public note: © 2019 American Physical Society. Received 15 October 2018; Revised manuscript received 13 December 2018; Published 8 January 2019.
• Created on: 2020-03-01 19:20:39