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Abstract

This article discusses inelastic scattering measurements on a single crystal of NpBi. The magnetic excitation spectrum consists of two branches with longitudinal and transverse polarization, respectively. 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 T(N). As the ordered magnetic moment in NpBi has the free ion Np(3+) moment value, the anisotropy gap cannot originate from crystal electric field interactions, and the triple-k structure of NpBi is anticipated to be stabilized by two-ion quadrupolar terms.

Additional information

Authors: BOURDAROT F ET AL, CEA, CEN Grenoble (FR);BOSSY J, Institut Laue-Langevin, Genoble (FR);MONACHESI P, Universita dell'Aquila, Dipartimento di Fisica (IT);REBIZANT J ET AL, JRC Karlsruhe (DE);VOGT O, ETH, Zurich (CH)
Bibliographic Reference: Article: Physical Review B (1997)
Record Number: 199711544 / Last updated on: 1997-12-09
Category: PUBLICATION
Original language: en
Available languages: en
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