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\begin{document}
\title{Low-lying thermal excitations on the border \\of ferromagnetism in the filled skutterudite NdOs$_{4}$As$_{12}$}
\author{\underline{A. Rudenko}}
\affiliation{Institute of Low Temperature  and Structure Research,\\ Polish Academy of Sciences, Wroc\l{}aw, Poland}
\author{A. Szewczyk}
\affiliation{Institute of Physics, Polish Academy of Sciences, Warsaw, Poland}
\author{Z. Henkie}
\affiliation{Institute of Low Temperature  and Structure Research,\\ Polish Academy of Sciences, Wroc\l{}aw, Poland}
\author{T. Cichorek}
\affiliation{Institute of Low Temperature  and Structure Research,\\ Polish Academy of Sciences, Wroc\l{}aw, Poland}
\begin{abstract}
Single crystals of the filled-skutterudite compound NdOs$_{4}$As$_{12}$ were grown by mineralization in a molten Cd:As flux. Features related to a ferromagnetic transition at $\simeq$~1.1\,K are observed in both transport and thermodynamic properties. Magnetic entropy considerations combined with magnetization data point at a quartet ground state of the Nd$^{3+}$ multiplet being well separated from a first excited state. Unexpectedly, a Schottky anomaly with the maximum at $\simeq$~0.93 K emerges on the border of the ferromagnetically ordered state. Additionally, a small magnetic field of 0.1 T shifts the Schottky peak above the Curie temperature. Thus, its origin cannot be related to the molecular-field splitting, as frequently observed for other ferromagnets. We attribute the Schottky anomaly with an energy separation $\Delta/k_{\rm{B}}\approx$~2.2~K to a lowering of the \textit{T}$_{h}$ cubic point symmetry of the Nd$^{3+}$ ions due to an unusual distortion of the Os cage, as recently proposed for PrOs$_{4}$Sb$_{12}$ and NdOs$_{4}$Sb$_{12}$ [1].


\textbf{References:}
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{\scriptsize[1] T. Keiber \textit{et al.}, Phys. Rev. B \textbf{86}, 174106 (2012).}
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\end{abstract}
\maketitle

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