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

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

doi:10.1063/1.126518

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

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

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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+.

Original language	English
Pages (from-to)	2925-2927
Journal	Applied Physics Letters
Volume	76
Issue number	20
DOIs	https://doi.org/10.1063/1.126518
Publication status	Published - 2000
MoE publication type	A1 Journal article-refereed

Keywords

superconductor

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

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 M{\"o}ssbauer spectroscopy. From 5 K to room temperature the M{\"o}ssbauer 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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T1 - Evidence for valence fluctuation of Fe in Sr_(2)FeMoO_(6-w) double perovskite

AU - Linden, J.

AU - Yamamoto, T.

AU - Karppinen, M.

AU - Yamauchi, H.

AU - Pietari, T.

PY - 2000

Y1 - 2000

N2 - 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+.

AB - 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+.

KW - superconductor

U2 - 10.1063/1.126518

DO - 10.1063/1.126518

M3 - Article

SN - 0003-6951

VL - 76

SP - 2925

EP - 2927

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 20

ER -

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

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