De Haas-van Alphen oscillations in the organic quasi-two-dimensional metal (ET)8[Hg4Cl12(C6H5Cl)2]

The behavior of de Haas-van Alphen oscillations in the quasi-2D organic metal (ET) 8 [Hg 4 Cl 12 (C 6 H 5 Cl) 2 ] was studied in detail. The section of the Fermi surface of this metal is a two-dimensional network of magnetic breakdown orbits. Only two frequencies, which corresponded to allowed closed orbits, F A and F MB , were detected. This is in agreement with the earlier studies of Shubnikov-de Haas oscillations in this metal. The reason for the absence of other allowed frequencies remains unclear. The angular dependences of the amplitudes of F A and F MB oscillations contain a series of “spin zeros.” An analysis of their positions led us to suggest that many-particle interactions were weakened in (ET) 8 [Hg 4 Cl 12 (C 6 H 5 Cl) 2 ].