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|Title:||Magnetic Excitations in NpBi.|
|Authors:||BOURDAROT F.; BOSSY J.; BURLET P.; FAEK B.; MONACHESI P.; REBIZANT Jean; REGNAULT L.p.; SPIRLET Jean claude; VOGT O.|
|Citation:||Physical Review B vol. 56 no. 21 p. 14029-14035|
|Type:||Articles in periodicals and books|
|Abstract:||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.|
|JRC Directorate:||Nuclear Safety and Security|
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