Evidence for valence fluctuation of Fe in Sr[sub 2]FeMoO[sub 6-w] double perovskite
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© 2000 AIP Publishing. This is the accepted version of the following article: Lindén, J. & Yamamoto, T. & Karppinen, Maarit & Yamauchi, H. & Pietari, T. 2000. Evidence for valence fluctuation of Fe in Sr[sub 2]FeMoO[sub 6-w] double perovskite. Applied Physics Letters. Volume 76, Issue 20. 2925-2927. ISSN 0003-6951 (printed). DOI: 10.1063/1.126518, which has been published in final form at http://scitation.aip.org/content/aip/journal/apl/76/20/10.1063/1.126518.
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School of Chemical Technology |
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2000
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Language
en
Pages
2925-2927
Series
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
Keywords
dielectric oxides, magnetoresistance, iron
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Citation
Lindén, J. & Yamamoto, T. & Karppinen, Maarit & Yamauchi, H. & Pietari, T. 2000. Evidence for valence fluctuation of Fe in Sr[sub 2]FeMoO[sub 6-w] double perovskite. Applied Physics Letters. Volume 76, Issue 20. 2925-2927. ISSN 0003-6951 (printed). DOI: 10.1063/1.126518.