Magnetoresistance effect in the fluctuating-valence BaSmFe_(2)O_(5+w) system

J. Nakamura; J. Linden; M. Karppinen; H. Yamauchi

doi:10.1063/1.1310170

Magnetoresistance effect in the fluctuating-valence BaSmFe_(2)O_(5+w) system

J. Nakamura, J. Linden, M. Karppinen, H. Yamauchi

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Abstract

The occurrence of negative magnetoresistance (MR) in semiconductive BaSmFe2O5+w double-perovskite samples is demonstrated. A peak in the MR value was observed at the Verwey–type transition temperature. The transition signifies the charge separation of the Fe2.5+ fluctuating mixed valence state into high-spin Fe2+ and Fe3+. The samples were ferrimagnetic with a Curie temperature of ∼710 K. Upon oxidizing/reducing the samples the size of the MR peak and the temperature at which the peak occurred varied. The largest MR value observed was 1.4% at 7 T.

Original language	English
Pages (from-to)	1683-1685
Journal	Applied Physics Letters
Volume	77
Issue number	11
DOIs	https://doi.org/10.1063/1.1310170
Publication status	Published - 2000
MoE publication type	A1 Journal article-refereed

Keywords

superconductor

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10.1063/1.1310170

1.1310170Final published version, 268 KB

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title = "Magnetoresistance effect in the fluctuating-valence BaSmFe_(2)O_(5+w) system",

abstract = "The occurrence of negative magnetoresistance (MR) in semiconductive BaSmFe2O5+w double-perovskite samples is demonstrated. A peak in the MR value was observed at the Verwey–type transition temperature. The transition signifies the charge separation of the Fe2.5+ fluctuating mixed valence state into high-spin Fe2+ and Fe3+. The samples were ferrimagnetic with a Curie temperature of ∼710 K. Upon oxidizing/reducing the samples the size of the MR peak and the temperature at which the peak occurred varied. The largest MR value observed was 1.4% at 7 T.",

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T1 - Magnetoresistance effect in the fluctuating-valence BaSmFe_(2)O_(5+w) system

AU - Nakamura, J.

AU - Linden, J.

AU - Karppinen, M.

AU - Yamauchi, H.

PY - 2000

Y1 - 2000

N2 - The occurrence of negative magnetoresistance (MR) in semiconductive BaSmFe2O5+w double-perovskite samples is demonstrated. A peak in the MR value was observed at the Verwey–type transition temperature. The transition signifies the charge separation of the Fe2.5+ fluctuating mixed valence state into high-spin Fe2+ and Fe3+. The samples were ferrimagnetic with a Curie temperature of ∼710 K. Upon oxidizing/reducing the samples the size of the MR peak and the temperature at which the peak occurred varied. The largest MR value observed was 1.4% at 7 T.

AB - The occurrence of negative magnetoresistance (MR) in semiconductive BaSmFe2O5+w double-perovskite samples is demonstrated. A peak in the MR value was observed at the Verwey–type transition temperature. The transition signifies the charge separation of the Fe2.5+ fluctuating mixed valence state into high-spin Fe2+ and Fe3+. The samples were ferrimagnetic with a Curie temperature of ∼710 K. Upon oxidizing/reducing the samples the size of the MR peak and the temperature at which the peak occurred varied. The largest MR value observed was 1.4% at 7 T.

KW - superconductor

U2 - 10.1063/1.1310170

DO - 10.1063/1.1310170

M3 - Article

SN - 0003-6951

VL - 77

SP - 1683

EP - 1685

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 11

ER -

Magnetoresistance effect in the fluctuating-valence BaSmFe_(2)O_(5+w) system

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