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Ferromagnetism and possible heavy fermion behavior in single crystals of NdOs$_4$Sb$_{12}$

P. -C. Ho·W. M. Yuhasz·N. P. Butch·N. A. Frederick·T. A. Sayles·J. R. Jeffries·M. B. Maple·J. B. Betts·A. H. Lacerda·P. Rogl·G. Giester
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Abstract

Single crystals of the filled-skutterudite compound NdOs$_4$Sb$_{12}$ have been investigated by means of electrical resistivity, magnetization, and specific heat measurements. The NdOs$_4$Sb$_{12}$ crystals have the LaFe$_4$P$_{12}$-type cubic structure with a lattice parameter of 9.3 Å. Possible heavy-fermion behavior is inferred from specific heat measurements, which reveal a large electronic specific heat coefficient $γ\approx 520$ mJ/mol-K$^2$, corresponding to an effective mass $m^* \sim$ 98 $m_e$. Features related to a ferromagnetic transition at {$\sim$ 0.9 K} can be observed in electrical resistivity, magnetization and specific heat. Conventional Arrott-plot analysis indicates that NdOs$_4$Sb$_{12}$ conforms to mean-field ferromagnetism.

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P. -C. Ho, W. M. Yuhasz, N. P. Butch, N. A. Frederick, T. A. Sayles, J. R. Jeffries, M. B. Maple, J. B. Betts, A. H. Lacerda, P. Rogl, G. Giester. 2005-07-04. Ferromagnetism and possible heavy fermion behavior in single crystals of NdOs$_4$Sb$_{12}$. https://doi.org/10.1103/physrevb.72.094410

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