Magnetization, specific heat, and thermal conductivity of hexagonal ErMnO${}_3$ single crystals

Abstract

We report a study of magnetism and magnetic transitions of hexagonal ErMnO${}_3$ single crystals by magnetization, specific heat and heat transport measurements. Magnetization data show that the $c$-axis magnetic field induces three magnetic transitions at 0.8, 12 and 28 T. The specific heat shows a peak at 2.2 K, which is due to a magnetic transition of Er${}^{3+}$ moments. For low-$T$ thermal conductivity ($\kappa$), a clear dip-like feature appears in $\kappa (H)$ isotherm at 1--1.25 T for $H\parallel ab$; while in the case of $H\parallel c$, a step-like increase is observed at 0.5--0.8 T. The transition fields in $\kappa (H)$ are in good agreement with those obtained from magnetization, and the anomaly of $\kappa$ can be understood by a spin-phonon scattering scenario. The natures of magnetic structures and corresponding field-induced transitions at low temperatures are discussed.

11 pages, 14 figures, accepted for publication in Phys. Rev. B

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