Structure, magnetic and magnetoresistive properties of La0.7Sr0.3Mn(1-x)Sn(x)O3 samples (0 < x < 0.20)

Structural, magnetic, and transport properties of polycrystalline La0.7Sr0.3Mn(1-x)Sn(x)O3 have been experimentally investigated. Single-phase samples were obtained in the range 0 < x < 0.20 by a conventional solid-state reaction method in air. The substitution of Sn4+ at the Mn site results i...

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Bibliographic Details
Published in:Journal of alloys and compounds 2005-08, Vol.399 (1-2), p.20-26
Main Authors: Kallel, N, Frohlich, K, Pignard, S, Oumezzine, M, Vincent, H
Format: Article
Language:English
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Summary:Structural, magnetic, and transport properties of polycrystalline La0.7Sr0.3Mn(1-x)Sn(x)O3 have been experimentally investigated. Single-phase samples were obtained in the range 0 < x < 0.20 by a conventional solid-state reaction method in air. The substitution of Sn4+ at the Mn site results in a significant lattice expansion, a reduction in the Curie temperature Tc and in the magnetic moment per Mn ion. In addition, gradual changes in the resistivity behaviour are observed in the Sn-doped samples leading to an enhancement of the magnetoresistance at low doping ratio. The results are analysed in relation to the variation in the Mn(3+)-O(2-)Mn(4+) network and to the magnetic disorder caused by the presence of the large and nonmagnetic Sn4 ions in the Mn sublattice.
ISSN:0925-8388
DOI:10.1016/j.jallcom.2005.03.019