SHUBNIKOV-DE HAAS OSCILLATIONS IN THE NEW ORGANIC CONDUCTOR (ET)(8)[HG4CL12(C6H5BR)(2)]

The behavior of the magnetoresistance in a quasi-two-dimensional organ ic conductor (ET)(8)[Hg4Cl8(C6H5Br)(2)] with different orientations of the magnetic field and at different temperatures was investigated. Sh ubnikov-de Haas oscillations were observed for H parallel to a+/-60 d egrees. The sheet of the Fermi surface corresponding to these oscillat ions is a cylinder whose axis is oriented along a and with the area o f the section in the (bc) plane is equal to approximately 13% of the c orresponding section of the Brillouin zone. An estimate of the cyclotr on mass of the carriers responsible for the observed oscillation gives m=1.25m(0). The representation obtained for the Fermi surface in the experimental material agrees with the theoretical calculations. (C) 1 995 American Institute of Physics.