FERMI SURFACE IN THE NEW ORGANIC QUASI-TWO-DIMENSIONAL METAL \alpha-(BETS)₂TlHg(SeCN)₄
Pesotskii S.I., Lyubovskii R.B., Nizhankovskii V.I., Biberacher W., Kartsovnik M.V., Andres K., Perenboom J.A.A.J., Kushch N.D., Yagubskii E.B., Kobayashi H.

Received: September 10, 1999

PACS: 71.25.Hc

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Quantum oscillations of de Haas-van Alphen and Shubnikov-de Haas and semiclassical angular oscillations of the magnetoresistance have been observed in the quasi-two-dimensional organic metal α-(BETS)₂TlHg(SeCN)₄. The quantum oscillations are connected with the cylindrical part of the Fermi surface. The angular oscillations are associated with the carrier motion on both cylindrical part and quasi-planar sheets of the Fermi surface. The values of the Dingle temperature, -3 K, and the effective mass, , have been defined. A possibility of the weakening of the many-body interactions has been shown in this compound.