BAND PARAMETERS OF FESI SINGLE-CRYSTALS DETERMINED BY MAGNETIC MEASUREMENTS

The results of magnetization and magnetic-susceptibility measurements on FeSi single crystals are presented. The temperature dependence of t he magnetic susceptibility in the range 5-300 K could be explained by contribution from the temperature-dependent parts due to paramagnetic centers and due to the carriers excited thermally in the intrinsic con ductivity region. It is shown that the contribution to magnetic suscep tibility of FeSi from single-occupied Anderson localized states is neg ligible. The values of the Curie-Weiss temperatures, an energy gap, as well as density-of-states effective mass were estimated.