J. Phys. I France 3 (1993) 1187-1199
Magnetotransport investigation of the low-temperature state of transition (BEDT-TTF) TIHg(SCN) : evidence for a Peierls-type transitionM. V. Kartsovnik1, A. E. Kovalev1 and N. D. Kushch2
1 Institute of Solid State Physics, Russian Academy of Sciences, 142432, Chemogolovka, MD, Russia
2 Jnstitute of Chemical Physics in Chemogolovka, Russian Academy of Sciences, 142432, Chemogolovka, MD, Russia
(Received 22 December 1992, accepted 26 January 1993)
Detailed magnetoresistance measurements have been performed on (BEDT-TTF) TlHg(SCN) . An analysis of angle dependent semi-classical magnetoresistance oscillations is presented in connection with possible changes in the electron spectrum at low temperatures. A spin density wave is proposed to arise leading to a modification of the Fermi surface so that new open sheets appear, consistent with the observed angular magnetoresistance oscillations. Some details of the Shubnikov-de Haas effect are also presented which can be explained by the existence of a magnetic breakdown network, in agreement with the proposed low- temperature electronic state of the compound.
72.15G - 73.201 - 74.70K
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