Evidence for valence fluctuation of Fe in Sr_(2)FeMoO_(6-w) double perovskite

Linden, J.; Yamamoto, T.; Karppinen, M.; Yamauchi, H.; Pietari, T.

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Evidence for valence fluctuation of Fe in Sr_(2)FeMoO_(6-w) double perovskite

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Title:	Evidence for valence fluctuation of Fe in Sr_(2)FeMoO_(6-w) double perovskite
Author(s):	Linden, J. ; Yamamoto, T. ; Karppinen, M. ; Yamauchi, H. ; Pietari, T.
Date:	2000
Language:	en
Pages:	2925-2927
Department:	Department of Chemistry
Series:	APPLIED PHYSICS LETTERS, Volume 76, issue 20
ISSN:	0003-6951 1077-3118
DOI-number:	10.1063/1.126518
Keywords:	superconductor
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Citation: 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
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+.

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