Title: Magnetic Multipole Order and Symmetry Considerations on the Ground State of Np4+ Ions in NpO2
Authors: DI MATTEO S.MAGNANI NicolaWASTIN FRANCKREBIZANT JEANCACIUFFO Roberto
Citation: JOURNAL OF ALLOYS AND COMPOUNDS vol. 444-445 p. 278-280
Publisher: ELSEVIER SCIENCE SA
Publication Year: 2007
JRC N°: JRC38259
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC38259
Type: Contributions to Conferences
Abstract: The ground-state symmetries of Np ions in the low temperature phase of NpO2 are discussed with reference to the results of resonant X-ray scattering experiments suggesting the occurrence of long-range multipolar order with electric quadrupole secondary order parameter. Two models have been proposed in the literature: one based on a 4 doublet (in D3d point group), the other on a 5 (6) singlet.We show, through a theoretical group analysis, that the 4 doublet is not compatible with the available experimental data. Our analysis supports the hypothesis of a singlet ground state.
JRC Institute:Institute for Transuranium Elements

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