Magnetoresistance effect in the fluctuating-valence BaSmFe2O5+w system

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

doi:10.1063/1.1310170

Magnetoresistance effect in the fluctuating-valence BaSmFe₂O_5+w system

J. Nakamura^*, J. Lindén, M. Karppinen, H. Yamauchi

^*Korresponderande författare för detta arbete

Fysik

Forskningsoutput: Tidskriftsbidrag › Artikel › Vetenskaplig › Peer review

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Sammanfattning

The occurrence of negative magnetoresistance (MR) in semiconductive BaSmFe₂O_5+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 Fe^2.5+ fluctuating mixed valence state into high-spin Fe²⁺ and Fe_3-. 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.

Originalspråk	Engelska
Sidor (från-till)	1683-1685
Antal sidor	3
Tidskrift	Applied Physics Letters
Volym	77
Nummer	11
DOI	https://doi.org/10.1063/1.1310170
Status	Publicerad - 11 sep. 2000
MoE-publikationstyp	A1 Tidskriftsartikel-refererad

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10.1063/1.1310170

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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.",

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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.

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