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Abstract

The antiferromagnetic 3k-structure of NpAs transforms to a ferrimagnetic one in magnetic fields below 60 kOe. The magnetic moment of the Np ion, as determined by neutrons, is 2.5 Bohr magnetons. NpSe becomes antiferromagnetic below 38 K with an as yet unresolved magnetic structure. The moment of Ns is only 1.35 magnetons. In samples of NpAs mixed with 5, 10 and 15% NpSe, ferrimagnetic structures were observed. The structure of the 5% sample was determined by neutrons and is described in detail. Admixture of NpSe increases the ferromagnetic exchange forces and reduces the ionic magnetic moment. The moment reduction is clearly demonstrated by Mössbauer experiments. The exchange forces are anisotropic. Antiferromagnetic exchange favours the 100 direction, while ferromagnetic exchange aligns the spins along the 111 direction.

Additional information

Authors: MATTENBERGER K, ETH, Laboratorium für Festkörperphysik, Zürich (CH);VOGT O, ETH, Laboratorium für Festkörperphysik, Zürich (CH);REBIZANT J, JRC Karlsruhe (DE);SPIRLET J C, JRC Karlsruhe (DE);BOURDAROT F ET AL., CEN Grenoble, DRFMC/SPSMS, Grenoble (FR)
Bibliographic Reference: Paper presented: International Conference on Magnetism, Edinburgh (GB), Sept. 8-14, 1991
Availability: Available from (1) as Paper EN 36391 ORA
Record Number: 199111360 / Last updated on: 1994-12-02
Category: PUBLICATION
Original language: en
Available languages: en
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