3d metal-substitution effects on magnetic and crystallographic properties of CrAs

Crystal structure parameter of Cr1−xMxAs (M=Ti, Fe, Co, and Ni; x≤0.1) have been precisely determined as a function of temperature from 77 to 320 K. Discontinuous changes of lattice parameters have been observed at a special temperature. By this temperature the Néel temperatures TN of Cr1−xMxAs have been determined because the anomaly of magnetic susceptibility has not been observed for them. The substitutions by the M atoms generally make TN of CrAs decrease remarkably. For the Fe, Co, and Ni substitutions, a nonmagnetic state is expected for a concentration more than 5%, 6%, and 9%, respectively. Dependence of TN on the substituent concentrations has been determined by taking account of the crystal volume effect on TN.