Abstract
The perovskite SmFeO${}_{3}$ exhibits type-$G$ antiferromagnetic ordering at ${T}_{\mathrm{N}}$ \ensuremath{\approx} 670 K and an easy axis rotation transition at ${T}_{\mathrm{SR}}$ \ensuremath{\approx} 480 K. Owing to the peculiar site anisotropy of rare-earth Sm${}^{3+}$, the moment on Sm${}^{3+}$ is oriented antiparallel to the canted spin from the Fe${}^{+}$ sublattice along the $a$ axis at $T$ ${T}_{\mathrm{SR}}$. The development of the magnetic moment on Sm${}^{3+}$ as temperature decreases makes it possible to balance the two magnetic moments at ${T}_{\mathrm{comp}}$. The application of a moderate external magnetic field along the $a$ axis can trigger an abrupt reversal of the moment on Sm${}^{3+}$ and the canted spin relative to the external field at a temperature around ${T}_{\mathrm{comp}}$. We report here a study of the field-induced magnetic-moment reversal in a single crystal SmFeO${}_{3}$ by measuring the magnetization and specific heat with the external field along different crystallographic axes.
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