Two-dimensional Fermi surface for the organic conductor κ-(BETS)2FeBr4

• Published in: Physica. B, Condensed matter Vol. 298; no. 1-4; pp. 557 - 561
• Main Authors: Uji, S, Shinagawa, H, Terai, Y, Yakabe, T, Terakura, C, Terashima, T, Balicas, L, Brooks, J.S, Ojima, E, Fujiwara, H, Kobayashi, H, Kobayashi, A, Tokumoto, M
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 01-04-2001; Elsevier
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Electron states; Electronic conduction in metals and alloys; Electronic transport in condensed matter; Exact sciences and technology; Fermi surface; Fermi surface: calculations and measurements; effective mass, g factor; Galvanomagnetic and other magnetotransport effects; Organic conductors; Physics; Quantum oscillation; Quantum oscillation; Organic conductors; Fermi surface; Very low frequency; Fluctuations; Brillouin zones; Antiferromagnetic materials; Conduction electron; Oscillations; Iron complexes; Magnetoresistance; Effective mass; Magnetic breakdown; Bromine complexes; Shubnikov-de Haas effect
• ISSN: 0921-4526; 1873-2135
• DOI: 10.1016/S0921-4526(01)00382-9

Magnetoresistance measurements have been performed for the organic conductor κ-(BETS)2FeBr4 to investigate the Fermi surface. Three fundamental Shubnikov-de Haas oscillations (α, β and γ) were observed. The cross-sectional areas corresponding to the α and β oscillations are about 20% and 100% in the first Brillouin zone, respectively. The oscillations can be assigned to the closed orbit and the magnetic breakdown orbit. The effective masses of the conduction electrons are determined to be 5.2m0 for α and 7.9m0 for β. The heavy masses are probably due to the antiferromagnetic fluctuation effect of the Fe spins. The origin of the oscillation γ with very low frequency is not explained by the band calculation.