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

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

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

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Title:	Magnetoresistance effect in the fluctuating-valence BaSmFe_(2)O_(5+w) system
Author(s):	Nakamura, J. ; Linden, J. ; Karppinen, M. ; Yamauchi, H.
Date:	2000
Language:	en
Pages:	1683-1685
Department:	Department of Chemistry
Series:	APPLIED PHYSICS LETTERS, Volume 77, issue 11
ISSN:	0003-6951 1077-3118
DOI-number:	10.1063/1.1310170
Keywords:	superconductor
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Citation: Nakamura , J , Linden , J , Karppinen , M & Yamauchi , H 2000 , ' Magnetoresistance effect in the fluctuating-valence BaSmFe_(2)O_(5+w) system ' , Applied Physics Letters , vol. 77 , no. 11 , pp. 1683-1685 . https://doi.org/10.1063/1.1310170
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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