J. Phys. I France
Volume 2, Numéro 3, March 1992
Page(s) 223 - 228
DOI: 10.1051/jp1:1992136
J. Phys. I France 2 (1992) 223-228

Giant angular magnetoresistance oscillations in (BEDT-TTF) $_{\bf 2}$ TlHg(SCN) $_{\bf 4}$ : the warped plane Fermi surface effect

M.V. Kartsovnik1, A.E. Kovalev1, V.N. Laukhin2 and S.I. Pesotskii2

1  Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, MD, 142432, Russia
2  Chernogolovka Institute of Chemical Physics, Russian Academy of Sciences, Chernogolovka, MD, 142432, Russia

(Received 29 December 1991, accepted 13 January 1992)

Measurements of magnetoresistance anisotropy in a quasi-two-dimensional conductor (BEDT-TTF) 2TlHg(SCN) 4 have been performed. Giant angular magnetoresistance oscillations have been found upon rotating the magnetic field in different planes perpendicular to the highly conducting ac-plane. The phenomenon is proposed to be associated with specifics of th electron motion along the open FS sheets under the magnetic field. The analysis of the oscillations reveals some qualitative differences between a calculated high temperature position of the open Fermi surface sheets and that found at low temperatures.

© Les Editions de Physique 1992

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