Low-temperature specific heat and magnetic properties of the filled skutterudite ferromagnet NdRu₄As₁₂

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• 作者：A. Rudenko ; Z. Henkie ; T. Cichorek ; ^{T.Cichorek@int.pan.wroc.pl" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Filled skutterudites ; Low-T ferromagnetism ; Schottky anomaly
• 刊名：Solid State Communications
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：242
• 期：Complete
• 页码：21-24
• 全文大小：843 K

文摘

We present the low-temperature specific heat and magnetic properties of the filled skutterudite compound NdRu₄As₁₂ that exhibits a ferromagnetic transition at $T_{\mathrm{C}}\simeq 2.3\mathrm{K}$. Magnetic entropy considerations point at a quartet ground state of the Nd³⁺${\mathrm{Nd}}^{3+}$ ions. Deep in the ferromagnetic state, the heat capacity shows a Schottky anomaly that we ascribe to the Zeeman splitting in the presence of a molecular field. Comparison of the specific heats of NdRu₄As₁₂ and its Os-based homologue near their Curie temperatures supports our earlier observation suggesting an unusual lowering of the T_h cubic point symmetry in the latter filled skutterudite.