Heat Capacity of CrBr3from 14 to 360°K

Abstract

The heat capacity of Cr${\mathrm{Br}}_3$ shows a lambda anomaly peaked at 32.55°K, a temperature somewhat lower than the reported Curie temperature of 37°K. Assuming the validity of the spin-wave dispersion relation of Davis and Narath, the entire magnetic heat capacity was derived. As is typical of a predominantly two-dimensional structure, this curve yields a large amount of entropy and energy order $\frac{(S_{\infty }-S_c)}{R}=0.62\mathrm{}$ and $\frac{(E_{\infty }-E_c)}{(E_{\infty }-E_0)}=0.72\mathrm{}$.