Magnetic Properties of (Cr_1−xNi_x)₂As Single Crystal Compounds

抄録

Measurements of magnetization and susceptibility were made on the hexagonal (Cr_1−xNi_x)₂As single crystal compounds. The compounds were antiferromagnetic for 0.4<x≤0.45 and ferromagnetic for 0.45<x≤0.7. The concentration dependences of the magnetic transition temperature, the saturation magnetization and the second order anisotropy constant at 4.2 K show maxima of 188 K (T_c), 1.19 μ_B per formula unit and 1.46×10⁶ erg/cm³ at x=0.5, respectively. The Curie constant is independent of x for 0.375≤x≤0.5, while it decreases with increasing x for x>0.5. The magnetization curves in the antiferromagnetic compounds at 4.2 K have relatively low critical fields. The compound of x=0.425 shows an unusual magnetization curve. The results were briefly discussed on the basis of the theory of spin fluctuations.