Mössbauer-effect study of competitive exchange interactions in UNi1−xCoxGa solid solutions

Results of Mossbauer spectroscopy of 119Sn atoms substituted on Ga sites in the UNi1-xCoxGa solid solutions are presented and discussed together with previously reported magnetization data in terms of evolution of magnetism between the antiferromagnet UNiGa and ferromagnet UCoGa. The Mossbauer spect...

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Bibliographic Details
Published in:Journal of alloys and compounds 2004-02, Vol.365 (1-2), p.73-79
Main Authors: Krylov, V.I., Delyagin, N.N., Andreev, A.V., Sechovský, V., Rozantsev, I.N.
Format: Article
Language:English
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Summary:Results of Mossbauer spectroscopy of 119Sn atoms substituted on Ga sites in the UNi1-xCoxGa solid solutions are presented and discussed together with previously reported magnetization data in terms of evolution of magnetism between the antiferromagnet UNiGa and ferromagnet UCoGa. The Mossbauer spectra were analyzed by considering the hyperfine field transferred to the 119Sn nucleus from the six nearest U magnetic moments and a weak signal due to anisotropic polarization of Sn 5p states. The low-temperature spectra for UNiGa and UCoGa are consistent with their ground-state magnetic structures. The nonmagnetic component observed for UNiGa persists in the spectra for x up to 0.4 which indicates the presence of antiferromagnetically coupled U moments. The nonmagnetic component emerging in the spectra for x around 0.77 is tentatively attributed to clusters of frustrated U magnetic moments surrounding the 119Sn nuclei.
ISSN:0925-8388
DOI:10.1016/S0925-8388(03)00659-5