Title: Magnetic Excitations in NpBi.
Authors: BOURDAROT F.BOSSY J.BURLET P.FAEK B.MONACHESI P.REBIZANT JeanREGNAULT L.p.SPIRLET Jean claudeVOGT O.
Citation: Physical Review B vol. 56 no. 21 p. 14029-14035
Publication Year: 1997
JRC N°: JRC15507
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC15507
Type: Articles in Journals
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 Institute:Institute for Transuranium Elements

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