Abstract
Magnetoresistance studies of a new quasi-two- dimensional organic metal, (BEDT-TTF) 2T1Hg(SeCN) 4, are presented. Angular oscillations of the semi-classical magnetoresistance and very strong Shubnikov-de Haas (SdH) oscillations have been found both associated with an extremely weakly warped Fermi surface cylinder with the cross-sectional area amounting to 16% of the first Brillouin zone. The shape of the Fermi surface cross-section has been reconstructed using the measured periods of the angular magnetoresistance oscillations. The spin-splitting effect manifested in a non-monotonous angular dependence of the SdH oscillations points to the importance of many-body interactions in the system.
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