Abstract
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 x Se 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 CoS 2 . 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 CoS 2 and it decreased gradually with increasing Se content. The electrical resistivity in low temperatures showed a T 2 -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.
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