Ferromagnetic and antiferromagnetic arrangements of uranium magnetic moments in non-stoichiometric UNi1−xGa1+x compounds
✍ Scribed by V.I. Krylov; N.N. Delyagin; I.N. Rozantsev
- Publisher
- Elsevier Science
- Year
- 2009
- Tongue
- English
- Weight
- 870 KB
- Volume
- 149
- Category
- Article
- ISSN
- 0038-1098
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✦ Synopsis
The local magnetic configurations in the non-stoichiometric UNi 1-x Ga 1+x (x = ±0.03) compounds have been investigated by Mössbauer spectroscopy technique. The compounds are characterized by coexistence of ferro-and antiferromagnetic alignments of uranium magnetic moments in the adjacent U-Ni layers. At 5 K, a rather small deviation from the exact 1:1:1 stoichiometry (both excess, as well as deficit, of Ni) leads to the drastic increase in the fraction of the ferromagnetic local configuration (up to 73% at x = +0.03 and 66% at x = -0.03). The fraction of ferromagnetic domains decreases gradually with temperature. At the vicinity of the Curie temperature, the fraction of the ferromagnetic configuration approaches 33% which corresponds to the complete restoration of the ''ideal'' antiferromagnetic structure, which is peculiar to the stoichiometric UNiGa compound.