Magnetic Susceptibility ofαMnS

Abstract

The magnetic susceptibility of a powder sample of $\alpha \mathrm{MnS}$ was measured from 90°K to 800°K by an absolute Gouy method. The Néel temperature was found to be 154°K. There was no evidence of thermal hysteresis and the susceptibility was independent of field strength over a range of fields between 2000 and 3000 oersteds. Two sets of Weiss-Curie constants fitted the data above the Néel temperature. Between the Néel temperature and 300°K, values of $\theta =490\mathrm{}°$K and $C_M=4.40\mathrm{}$ were calculated. Above 400°K, the respective values were 380°K and 3.90. It is suggested that the persistence of short-range ordering effects to temperatures well above the Néel temperature affects the value of these constants and that the values above 400°K are probably more representative.