Title: Antiferromagnetic Order in NpRhGa5
Citation: JOURNAL OF ALLOYS AND COMPOUNDS vol. 386 p. 57-62
Publisher: Elsevier B.V.
Publication Year: 2005
JRC N°: JRC30451
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC30451
Type: Articles in periodicals and books
Abstract: NpRhGa5 develops antiferromagnetic order below TN = 37 K. Contrary to its NpCoGa5 counterpart, NpRhGa5 does not show any phase transition in applied magnetic fields up to 9 T, but undergoes a second magnetic transition—attributed to a reorientation of the magnetic moments from the c-axis to the basal plane—at T = 32 K, as evidenced by magnetization, resistivity, specific heat and 237Np Mossbauer data. The latter also indicates the occurrence of a Np3+ charge state and an ordered Np moment of 0.96microB. The comparison of the magnetic properties of NpRhGa5 and AnTGa5 (An = U, Np, Pu; T = Co, Rh) compounds confirms that AnRhGa5 and AnCoGa5 are driven by common underlying physics and shows that magnetic interactions are enhanced in AnCoGa5 compounds, suggesting a possible link with the enhanced superconductivity in PuCoGa5 compared to PuRhGa5.
JRC Directorate:Nuclear Safety and Security

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