Fermiology of new charge-transfer salts, β″-(BEDT-TTF) 4[(H3O)M(C2O4)3]-solvent where M = Ga, Cr and Fe

Coldea, AI, Bangura, AF, Ardavan, A, Singleton, J, Akutsu-Sato, A, Akutsu, H, Turner, SS and Day, P (2004) Fermiology of new charge-transfer salts, β″-(BEDT-TTF) 4[(H3O)M(C2O4)3]-solvent where M = Ga, Cr and Fe Journal De Physique. IV : JP, 114. pp. 205-209.

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Abstract

We report high-field magnetotransport measurements on β″-(BEDT- TTF)4[(H3O)M(C2O4) 3]· solvent, where M=Ga3+, Cr3+ and Fe3+ and solvent=C5H5N. In spite of their differing transition metal-ions, M, the three compounds exhibit similar magnetic quantum oscillation spectra superimposed on a positive magnetoresistance. At least four independent quantum oscillation frequencies have been identified, corresponding to two different hole and electron pockets of the Fermi surface which follow the rules of a compensated metal. Observation of the small pockets could be the result of the Fermi surface reconstruction induced by a possible density wave. The effective masses are very similar for different samples and for different pockets range between meff ≈ 0.5-1.1 me whereas the Dingle temperatures varies between TD ≈ 1.4-4 K. At low temperature, the longitudinal magnetoresistance violates Kohler's rule, suggesting that the interlayer transport in these quasi-2D systems cannot be related to a single scattering time and that the disorder plays an important role. © EDP Sciences.

Item Type:	Article
Divisions :	Surrey research (other units)
Authors :	Name Email ORCID Coldea, AI Bangura, AF Ardavan, A Singleton, J Akutsu-Sato, A Akutsu, H Turner, SS s.s.turner@surrey.ac.uk Day, P
Date :	1 December 2004
DOI :	10.1051/jp4:2004114045
Depositing User :	Symplectic Elements
Date Deposited :	17 May 2017 13:03
Last Modified :	24 Jan 2020 23:19
URI:	http://epubs.surrey.ac.uk/id/eprint/837729

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