Galvanomagnetic Effect of CoS2 Single Crystal

Making use of a single crystal of ferromagnetic CoS 2 , the resistivity, the transverse and longitudinal magnetoresistances and the Hall effect were measured in the temperature range from 4.2 K to 130 K under magnetic field strength up to 15.3 kOe. The ordinary and extraordinary Hall coefficients were determined. By assuming an electron correlation effect on the effective mass and the relaxation time for the majority and minority spin band electrons, the anomalies of resistivity and magnetoresistance were explained. The electron configuration having dγ 1 was confirmed from the ordinary Hall coefficient. The extraordinary Hall coefficient resembles that of Fe. In appendix, determinations of the Curie point and the critical exponents of this crystal were shown.