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J. Phys. Soc. Jpn. 65, pp. 1010-1018 (1996) [9 Pages]
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Pressure Effects to the Anomalous State of Quasi Two-Dimensional Conductor α-(BEDT-TTF) 2KHg(SCN) 4

Noriaki Hanasaki1, Seiichi Kagoshima1, Noboru Miura2, and Gunzi Saito3
+ Affiliations
1Department of Pure and Applied Sciences, University of Tokyo, Komaba 3-8-1, Meguro, Tokyo 1532Institute for Solid State Physics, University of Tokyo, Roppongi 7-22-1, Minato, Tokyo 1063Department of Chemistry, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo, Kyoto 606
Received November 15, 1995

Quasi two-dimensional conductor α-(BEDT-TTF) 2 KHg(SCN) 4 has an anomalous electronic state in the low-temperature-low-magnetic-field-low-pressure regime below 8 K, 22 T, and 5 kbar. Angle dependent magnetoresistance oscillations in the anomalous state were measured under high pressure with the magnetic field rotated around two axes perpendicular to each other. We studied the topology of the Fermi surface below and above the critical pressure (5 kbar) to compare the normal state with the anomalous one. In the anomalous state, we found a new series of angle dependent magnetoresistance oscillations. In the normal state above the critical pressure, we found a quasi one-dimensional Fermi surface parallel to the b * c * -plane. This is considered to be responsible for the Fermi surface nesting that causes the anomalous state. Electronic states are discussed in relation to possible origins of the anomalous state.

©1996 The Physical Society of Japan
https://doi.org/10.1143/JPSJ.65.1010
KEYWORDS: BEDT-TTF, angle dependent magnetoresistance oscillation, low-dimensional conductor, organic conductor, anomalous state, magnetoresistance, Fermiology

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