Hall Effect and Magnetoresistance of Co(S_<i>x</i>Se_1-<i>x</i>)₂, 0 ≤<i>x</i> ≤1

Abstract

The Hall effect and the transverse magnetoresistance of Co(S x Se 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 CoS 2 . 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.