6533b853fe1ef96bd12abf7d

RESEARCH PRODUCT

Magnetization and61Ni Mössbauer effect study of the ternary arsenide CrNiAs

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The results of x-ray diffraction, dc magnetization, and 61Ni M?ssbauer spectroscopy studies of the ternary arsenide CrNiAs are reported. This compound crystallizes in the orthorhombic Fe2P-type structure (space group ) with the lattice parameters a = 6.1128(2)?? and c = 3.6585(1)??. CrNiAs is a mean-field ferromagnet with Curie temperature TC = 171.9(1)?K and the critical exponents ? = 0.514(18), ? = 1.010(16), and ? = 2.922(10). The temperature dependence of the magnetic susceptibility above TC follows the modified Curie?Weiss law with a paramagnetic Curie temperature of 176.0(3)?K and effective magnetic moment per transition metal atom of 2.42(1)??B. The magnetic moment per formula unit at 4.2?K is found to be 1.114(33)??B. The hyperfine magnetic field at 61Ni nuclei at 4.2?K of 41.5(1.0)?kOe implies that the Ni atoms carry a magnetic moment of 0.15(3)??B, and that the moment carried by the Cr?atoms is 0.95(6)??B. The Debye temperature of CrNiAs is 221(1)?K.