Further Investigations on Magnetic Properties of Co(S_xSe_1−x)₂, (0≤x≤1)

抄録

Further investigations, succeeding to the works of J. Phys. Soc. Japan 26 (1969) 631 and 29 (1970) 323, on the magnetic properties of Co(S_xSe_1−x)₂ in the whole concentration ranges (0≤x≤1) were performed by means of high magnetic field, electrical resistivity and low temperature X-ray diffraction measurements. The first kind magnetic transition was found in the ferromagnetic phase except CoS₂. The metamagnetic behaviors were observed in the ferromagnetic (0.89<x<1.0) as well as paramagnetic (x<0.89) phases. The saturation moment per Co atom was obtained to be 0.855 μ_B for CoS₂ and it decreased gradually with increasing Se content. The electrical resistivity in low temperatures showed a T²-dependence. It was concluded that the itinerant electron model base on the spin fluctuation theory is more adequate than models based on a localized spin scheme.