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|Title:||Inelastic Neutron Scattering Study of Multipolar Order Parameter in NpO2|
|Authors:||MAGNANI Nicola; CARRETTA S.; CACIUFFO Roberto; SANTINI P.; AMORETTI G.; HIESS A.; REBIZANT J.; LANDER G. H.|
|Citation:||PHYSICAL REVIEW B vol. 78 p. 104425|
|Publisher:||AMERICAN PHYSICAL SOC|
|JRC Publication N°:||JRC48614|
|Type:||Articles in Journals|
|Abstract:||We have performed polarized inelastic neutron scattering experiments in the ordered phase of neptunium dioxide. The observation of magnetic scattering between 11 and 18 meV can be attributed to a transition between two states with the same expectation value of the electric quadrupole but opposite values of the magnetic triakontadipole. In contrast to resonant x-ray scattering, which detects the secondary order parameter electric quadrupoles associated with the 25 K phase transition, the results reported here are a manifestation of the primary magnetic order parameter. The experimental observations are discussed in relation to the current theoretical understanding of the low-energy magnetic dynamics of NpO2.|
|JRC Institute:||Institute for Transuranium Elements|
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