Competition between ferromagnetic and antiferromagnetic exchange interactions in the quasibinary U(Ge1−xSnx)2 compounds

The evolution of the magnetic ordering temperature TM and the low-temperature magnetic structure in the quasibinary compounds U(Ge1−xSnx)2 for 0.01≤x≤1 were studied by means of 119Sn Mössbauer spectroscopy. These compounds are solid solutions between the ferromagnet UGe2 (TC=52 K) and the antiferrom...

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Bibliographic Details
Published in:Journal of alloys and compounds 2002-09, Vol.343 (1-2), p.32-37
Main Authors: Krylov, V.I, Delyagin, N.N, Reyman, S.I, Rozantsev, I.N, Andreev, A.V, Sechovský, V
Format: Article
Language:English
Subjects:
Actinide compounds
Hyperfine interactions
Magnetically ordered materials
Mössbauer spectroscopy
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Summary:The evolution of the magnetic ordering temperature TM and the low-temperature magnetic structure in the quasibinary compounds U(Ge1−xSnx)2 for 0.01≤x≤1 were studied by means of 119Sn Mössbauer spectroscopy. These compounds are solid solutions between the ferromagnet UGe2 (TC=52 K) and the antiferromagnet USn2 (TN=75 K), both being collinear. The boundary compounds possess different easy-magnetization directions, the a- and c-axis, respectively. The minimum ordering temperature (Tmin≈36 K) has been found for x=0.58. The complex Mössbauer spectra observed for lower Sn concentrations could be attributed to the appearance of two non-collinear spin configurations characterized by a canting angle between pairs of U magnetic moments of 60 and 120°, respectively. When increasing the Sn concentration beyond x=0.58, the Mössbauer spectrum resembles that observed for USn2 which is accompanied by a rapid increase of TM.
ISSN:0925-8388
1873-4669
DOI:10.1016/S0925-8388(02)00145-7