Volume 55, Number 2, July 2001
|Page(s)||267 - 272|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||01 December 2003|
Spin and orbital moments in itinerant magnets
Institut Laue Langevin - B.P. 156, 38042 Grenoble,
Cedex 9, France
2 Département de Recherche Fondamentale sur la Matière Condensée CEA-Grenoble - 38054 Grenoble, France
3 European Commission, JRC, Institute for Transuranium Elements Postfach 2340, D-76125 Karlsruhe, Germany
4 W. Trzebiatowski Institute or Low Temperature and Structure Research Polish Academy of Sciences - P.O. Box 937, 50-950 Wroclaw, Poland
Accepted: 15 May 2001
Itinerant magnets with large orbital moments are uncommon. We show that is such a material where the itinerant magnetism is carried by the 5f states. The definitive evidence comes from neutron diffraction measurements of the magnetization distribution, where a significant difference is observed in the momentum dependence of the scattering amplitude above and below TN. The change in the magnetization distribution when the antiferromagnetic order appears is due to the antiparallel coupling of large atomic 5f spin and orbital moments below TN, whereas above TN there is spin degeneracy and no disordered local moments.
PACS: 75.10.-b – General theory and models of magnetic ordering / 75.25.+z – Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source X-ray scattering, etc.) / 71.15.Mb – Density functional theory, local density approximation, gradient and other corrections
© EDP Sciences, 2001
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