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|Title:||Magnetic Multipole Order and Symmetry Considerations on the Ground State of Np4+ Ions in NpO2|
|Authors:||DI MATTEO S.; MAGNANI Nicola; WASTIN FRANCK; REBIZANT JEAN; CACIUFFO Roberto|
|Citation:||JOURNAL OF ALLOYS AND COMPOUNDS vol. 444-445 p. 278-280|
|Publisher:||ELSEVIER SCIENCE SA|
|Type:||Articles in periodicals and books|
|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:||Nuclear Safety and Security|
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