Magnetotransport investigation of the low-temperature state of transition (BEDT-TTF)2TIHg(SCN)4 : evidence for a Peierls-type transition

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Abstract
Detailed magnetoresistance measurements have been performed on (BEDT-TTF)2TlHg(SCN)4. 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

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