Title
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Structural phase transition at low temperature, corresponding to charge ordering in the CMR perovskites
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Author
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Abstract
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The magneto resistive perovskites Nd0.5Sr0.5MnO3 and Pr0.5Sr0.41Ca0.09MnO3 undergo a transition from anti ferromagnetic insulator to ferromagnetic metal as function of temperature. The room temperature phase is orthorhombic with the space group Imma and the cell parameters a approximate to root 2a(p), b approximate to 2a(p), and c approximate to root 2a(p). A structural phase transition related to charge ordering accompanying the transition from ferromagnetic state to antiferromagnetic state has been evidenced by low temperature electron diffraction. This transition is reversible and a new superstructure, with a P-type orthorhombic cell. and lattice parameters parameters a approximate to 2 root 2a(p), b approximate to 2a(p), and c approximate to root 2a(p), is formed. |
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Language
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English
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Source (journal)
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Materials research bulletin. - New York, N.Y.
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Publication
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New York, N.Y.
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1996
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ISSN
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0025-5408
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DOI
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10.1016/S0025-5408(96)00090-6
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Volume/pages
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31
:8
(1996)
, p. 905-911
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ISI
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A1996UZ37300002
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Full text (Publisher's DOI)
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Full text (publisher's version - intranet only)
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