Evidence for valence fluctuation of Fe in Sr_(2)FeMoO_(6-w) double perovskite
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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en
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2925-2927
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APPLIED PHYSICS LETTERS, Volume 76, issue 20
Abstract
In this letter evidence for the formation of a valence-fluctuation state of iron, formally denoted as Fe2.5+, is presented. The system under study is the Sr2FeMoO6−w double perovskite, known for exhibiting a very large magnetoresistance. Samples of Sr2FeMoO6−w were synthesized by means of an encapsulation technique utilizing an Fe getter technique and characterized by 57Fe Mössbauer spectroscopy. From 5 K to room temperature the Mössbauer spectrum is dominated by a component with hyperfine parameter values between those expected for high-spin Fe3+ and high-spin Fe2+.Description
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Linden , J , Yamamoto , T , Karppinen , M , Yamauchi , H & Pietari , T 2000 , ' Evidence for valence fluctuation of Fe in Sr_(2)FeMoO_(6-w) double perovskite ' , Applied Physics Letters , vol. 76 , no. 20 , pp. 2925-2927 . https://doi.org/10.1063/1.126518