THERMOMAGNETIC EFFECTS IN A 2-DIMENSIONAL SYSTEM CONTAINING MIXED-VALENCE IMPURITIES

The results of calculation of the transverse Nernst-Ettinsgausen (NE) effect in a two-dimensional system containing mixed-valence impurities are presented. It is shown that the NE coefficient changes sign at lo w temperatures and when the iron content is fairly high. The unusual d ependence of the NE effect on iron content in the two-dimensional (HgS e:Fe) system at low temperatures is caused by electron scattering on t he aggregate of charged donors Fe(3+). At low temperatures and high co ncentration of iron ions the system of charged donors is the strongly correlated Coulomb liquid. (C) 1998 Elsevier Science B.V. All rights r eserved.