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Charge Ordering and Magnetotransport Transitions in Sm1/3Sr2/3FeO3−δ

✍ Scribed by Y.M. Zhao; M. Hervieu; N. Nguyen; B. Raveau

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
207 KB
Volume
153
Category
Article
ISSN
0022-4596

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✦ Synopsis

Charge ordering (CO) between Fe 3؉ and Fe 5؉ species and magnetotransport transition have been shown for the 5rst time in the perovskite Sm 1/3 Sr 2/ 3 FeO 3؊ by electron di4raction microscopy, by 57 Fe MoK ssbauer spectroscopy, and by measurements of transport and magnetic properties. This compound is charge ordered at T CO ‫؍‬ 110 K, which is signi5cantly lower than the temperature T N ‫؍‬ 150 K of the magnetotransport transition. A charge disproportionation 2Fe 4؉ Fe 3؉ ؉Fe 5؉ is evidenced by MoK ssbauer spectroscopy. The electron di4raction study shows the coexistence of orthorhombic and rhombohedral-type domains. A comparison with the other lanthanides (La, Pr, Nd) is also made. This suggests that the size of the Ln 3؉ ion is not the only parameter which governs the charge ordering in these perovskites, but the oxygen stoichiometry, which in6uences the Fe 5؉ formation, may also play a role in the CO phenomenon. 2000 Academic Press

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