The specific heat of the colossal magnetoresistance material ${\mathrm{Nd}}_{0.67}{\mathrm{Sr}}_{0.33}{\mathrm{MnO}}_3$ is reported for $0.35<~T<~280\mathrm{K},$ $H=0\mathrm{}$ and $1<~T<~120\mathrm{K},$ $H=9\mathrm{}\mathrm{T}.$ The results include a Schottky-like specific-heat anomaly for the Nd ordering, an “attenuation” of the Mn ordering anomaly, and a T-dependent “linear term,” $\gamma \mathrm{}\left(T\right)T.\mathrm{}$ This unusual combination of features is interpreted as arising from an interaction between the Nd and Mn spin systems. The expected magnetic entropy is recovered only if a contribution from the $\gamma \mathrm{}\left(T\right)T$ term is included.

• Received 9 September 1998

DOI:https://doi.org/10.1103/PhysRevB.59.127