Title: Crystal Structure and Physical Properties of NpRh2Sn, a New Np-Based Ternary Compound
Citation: Journal of Physics: Conference Series vol. 273 p. 1-4
Publication Year: 2011
JRC N°: JRC58747
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC58747
DOI: 10.1088/1742-6596/273/1/012024
Type: Articles in periodicals and books
Abstract: We report on the synthesis and physical characterization of a new compound, NpRh2Sn, prepared by arc-melting under argon atmosphere. Rietveld analysis of the powder x-ray diffraction pattern reveals an orthorhombic, UPd2Sn-type structure, with lattice parameters that are the shortest among the AnT2Sn series (An= U, Np, Pu, and T = Pd, Rh). A fit of the high-temperature magnetic susceptibility curve, ¿(T) gives a Curie-Weiss temperature TCW=-29K, and an effective magnetic moment µeff=2,42µB, close to the value expected for Np+3 (2,68µB). The stabilization of antiferromagnetic order below TN=34K is revealed by a cusp in ¿(T) and by a small anomaly in the specific heat curve, Cp(T). An enhanced value of the Sommerfeld coefficient, ¿=107 mJ/Np-mol K2, indicates a moderate heavy-fermion state. NpRh2Sn is the first member of the ANRh2S family, and a rare representative of heavy-fermion systems amidst Np-intermetallics.
JRC Directorate:Nuclear Safety and Security

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