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.
DI MATTEO S.;
MAGNANI Nicola;
WASTIN Franck;
REBIZANT Jean;
CACIUFFO Roberto;
2007-08-29
ELSEVIER SCIENCE SA
JRC38259
https://publications.jrc.ec.europa.eu/repository/handle/JRC38259,
10.1016/j.jallcom.2006.11.055,
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