We report a study of magnetism and magnetic transitions of hexagonal ${\mathrm{ErMnO}}_3$ 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 ${\mathrm{Er}}^{3+}$ moments. For low-$T$ thermal conductivity $\left(\kappa \right)$, a clear diplike feature appears in the $\kappa \left(H\right)$ isotherm at 1–1.25 T for $H\parallel ab$, while in the case of $H\parallel c$, a steplike increase is observed at 0.5–0.8 T. The transition fields in $\kappa \left(H\right)$ 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.

中文翻译：

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六角形ErMnO3单晶的磁化，比热和热导率

我们报告了六角形的磁性和磁性跃迁的研究 ${\mathrm{二氧化锰}}_3$通过磁化，比热和热传输测量获得单晶。磁化数据表明$C$轴磁场在0.8、12和28 T处感应出三个磁跃迁。比热在2.2 K处显示一个峰值，这是由于 ${尔}^{3+}$片刻。对于低$Ť$ 导热系数 $（\kappa ）$，便会在 $\kappa （H）$ 在1–1.25 T下等温 $H\parallel \mathrm{一个}b$，而在 $H\parallel C$，在0.5–0.8 T处观察到阶梯状增加。 $\kappa （H）$ 与从磁化获得的磁通量非常吻合，并且磁导率的异常 $\kappa$可以通过自旋声子散射场景来理解。讨论了低温下磁性结构的性质和相应的磁场感应跃迁。