Layered (Cu,Fe) oxides of double perovskite structure: Correlation between structural and magnetic-property changes in BaY(Cu0.5Fe0.5)2O5+δ upon high-pressure heat treatment

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Volume Title

A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

Authors

Nagase, M.
Lindén, J.
Miettinen, J.
Karppinen, M.
Yamauchi, H.

Date

1998

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Degree programme

Language

en

Pages

3371-3376

Series

Physical Review B, Volume 58, issue 6

Abstract

In this paper, we report the correlation between the magnetic property and the local structure in BaY(Cu0.5Fe0.5)2O5+δ of the “0112” phase containing an unusually large amount of excess oxygen, δ of ∼0.2, when heat treated under a high pressure of 5 GPa. Magnetic susceptibility measurements showed that upon the high-pressure heat treatment, the lower-temperature magnetic transition which had been observed in normal-pressure synthesized, antiferromagnetic BaY(Cu0.5Fe0.5)2O5 disappeared and the higher-temperature transition, i.e., the Néel temperature, was lowered. According to a Rietveld analysis based on x-ray-diffraction data and space group P4/mmm, the distinction between Cu and Fe positions along the c axis inside the oxygen pyramid disappeared. Coulometric titrations and Mössbauer spectroscopy measurements strongly suggested the existence of excess oxygen in the yttrium plane.

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Keywords

copper oxide, iron oxide, magnetic, perovskite, structure

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Citation

Nagase , M , Lindén , J , Miettinen , J , Karppinen , M & Yamauchi , H 1998 , ' Layered (Cu,Fe) oxides of double perovskite structure: Correlation between structural and magnetic-property changes in BaY(Cu0.5Fe0.5)2O5+δ upon high-pressure heat treatment ' , Physical Review B , vol. 58 , no. 6 , pp. 3371-3376 . https://doi.org/10.1103/PhysRevB.58.3371