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.
MAGNANI Nicola;
CARRETTA S.;
CACIUFFO Roberto;
SANTINI P.;
AMORETTI G.;
HIESS A.;
REBIZANT J.;
LANDER G. H.;
2008-11-07
AMERICAN PHYSICAL SOC
JRC48614
1098-0121,
https://publications.jrc.ec.europa.eu/repository/handle/JRC48614,
10.1103/PhysRevB.78.104425,
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