J. Phys. Soc. Jpn. 63, pp. 674-684 (1994) [11 Pages]
FULL PAPERS

The Origin of Anomalous Angular Dependent Magnetoresistance Oscillation Effect in α-(BEDT-TTF)2KHg(SCN)4

+ Affiliations
1Institute for Solid State Physics, University of Tokyo, Roppongi, Minato-ku, Tokyo 1062Department of Physics, Faculty of Science, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 1133Department of Pure and Applied Sciences, University of Tokyo, Komaba, Meguro-ku, Tokyo 1564International Superconductivity Technology Center, Superconductivity Research Laboratory, Nagoya Research Division, Mutsuno, Atsuta-ku, Nagoya 4565Department of Chemistry, Faculty of Science, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto 606

Angular dependent magnetoresistance oscillation (ADMRO) effect in α-(BEDT-TTF) 2 MHg(SCN) 4 [M: K, NH 4 ] has been studied as a function of the polar and azimuthal angles of applied magnetic field with respect to the most conducting a c -plane. The ADMRO effects in these two structurally similar compounds are drastically different in their azimuthal angle dependence and oscillation waveform. While the ADMRO in NH 4 Hg-salt is of the standard type arising from a warped cylindrical Fermi surface, that in KHg-salt is a novel type to be attributed to an open Fermi sheet. Calculation based on a model recently proposed for a quasi one-dimensional system quantitatively reproduces the essential features of the anomalous ADMRO in KHg-salt.

©1994 The Physical Society of Japan

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