Inelastic Neutron Scattering Study of Multipolar Order Parameter in NpO2
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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