A Mössbauer study of the quasi two-dimensional antiferromagnet TlFe2−x Se2 |
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| Authors: | L. Häggström A. Seidel R. Berger |
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| Affiliation: | (1) Institute of Physics, Uppsala University, Box 530, S-751 21 Uppsala, Sweden;(2) Present address: Department of Inorganic Chemistry, University of Groningen, Nijenborg 16, 9747 AG Groningen, The Netherlands |
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| Abstract: | TlFe2?x Se2 compounds withx from 0.36 to 0.40 have been examined with Mössbauer spectroscopy. The compounds order antiferromagnetically with broad magnetic transition regions whose width increases with decreasing Fe content. The Néel temperature decreases with x and the temperature variation of the magnetic hyperfine field indicates that the transition is of first order. In samples without vacancy ordering the Fe nuclei experience a different temperature variation of the hyperfine field than in compounds with ordered vacancies. |
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