Magnetic Excitations in NpBi.
We report inealstic neutron scattering measurements on a single crystal of NpBi. The magnetic excitation spectrum consists of two branches with longitudinal and transverse polarisation, resp. The excitations are interpreted as spin waves in an antiferromagnetic triple-k type-I structure. With increasing temperature, the anisotropy gap decreases monotonously and disappears at TN. As the ordered magnetic moment in NpBi has the free ion Np3+ moment value, the anisotropy gap cannot originate from crystal electric field interactions, and the tripe-k structure of NpBi is anticipated to be stabilized by two-ion quadrupolar terms.
BOURDAROT F.;
BOSSY J.;
BURLET P.;
FAEK B.;
MONACHESI P.;
REBIZANT Jean;
REGNAULT L.P.;
SPIRLET Jean Claude;
VOGT O.;
1997-11-20
JRC15507
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