Title: Inelastic Neutron Scattering Study of Multipolar Order Parameter in NpO2
Authors: MAGNANI NicolaCARRETTA S.CACIUFFO RobertoSANTINI P.AMORETTI G.HIESS A.REBIZANT J.LANDER G. H.
Citation: PHYSICAL REVIEW B vol. 78 p. 104425
Publisher: AMERICAN PHYSICAL SOC
Publication Year: 2008
JRC N°: JRC48614
ISSN: 1098-0121
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC48614
DOI: 10.1103/PhysRevB.78.104425
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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