Fermi surface in the new organic quasi-two-dimensional metal alpha-(BETS)(2)TlHg(SeCN)(4)

Quantum oscillations of de Haas-van Alphen and Shubnikov-de Haas and semicl assical angular oscillations of the magnetoresistance have been observed in the quasi-two-dimensional organic metal alpha-(BETS)(2)TlHg(SeCN)(4). The quantum oscillations are connected with the cylindrical part of the Fermi s urface. The angular oscillations are associated with the carrier motion on both the cylindrical part and quasi-planar sheets of the Fermi surface. The values of the Dingle temperature, T-D approximate to 2-3 K, and the effect ive mass, m* approximate to 1.03m(0), have been defined. The possibility of the weakening of multibody interactions has been shown in this compound. ( C) 2000 MAIK "Nauka/Interperiodica".