Conduction Phenomena in Monosilicides of Iron Group Transition Elements

抄録

The electrical resistivity, Hall coefficient and thermoelectric power have been measured over the temperature range from 4.2 to 800°K on Co_1−xMn_xSi(x\lesssim0.06), Co_1−xCr_xSi(x\lesssim0.04) and Co_1−xNi_xSi(x\lesssim0.10) solid solutions. The specimen is n-type when x=0. With increasing x, the specimens of Co_1−xNi_xSi become more n-type, while in the specimens of Co_1−xMn_xSi and Co_1−xCr_xSi, the contribution of hole conduction increases. The experimental data are qualitatively interpreted in terms of the overlapping band structure scheme, which is appropriate for Co_1−xFe_xSi solid solutions. It is concluded that the replacement of cobalt with manganese or chromium produces approximately one hole per atom, while the replacement of cobalt with nickel produces approximately one electron per atom in the solid solutions.