Hall Effect and Magnetoresistance of Co(S_xSe_1−x)₂, 0≤x≤1

抄録

The Hall effect and the transverse magnetoresistance of Co(S_xSe_1−x)₂ for 0≤x≤1 were observed in the field strength up to 90 kOe in the temperature ranges 4.2 K to 300 K. The ordinary and extraordinary Hall coefficients were determined. The negative ordinary coefficient gave about one electron in the dγ band for 0≤x≤1. The extraordinary coefficient was positive in the metamagnetic and ferromagnetic states except for a negative coefficient of CoS₂. The magnetoresistance of the metamagnetic phase changed remarkably by a magnetic saturation. The increase of the resistivity in the magnetized state was about 60 μΩcm as compared with the non-magnetized state.