Temperature-induced A–B intersite charge transfer in an A-site-ordered LaCu3Fe4O12 perovskite

Y. W. Long (), N. Hayashi, T. Saito, M. Azuma, S. Muranaka and Y. Shimakawa ()
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Y. W. Long: Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
N. Hayashi: Graduate School of Human and Environmental Studies, Kyoto University, Sakyo, Kyoto 606-8501, Japan
T. Saito: Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
M. Azuma: Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
S. Muranaka: Graduate School of Human and Environmental Studies, Kyoto University, Sakyo, Kyoto 606-8501, Japan
Y. Shimakawa: Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan

Nature, 2009, vol. 458, issue 7234, 60-63

Abstract: Transition metal takes charge The introduction of 'foreign' elements into transition-metal oxides (called chemical doping) can change the valence state of the metal's cations and hence modify the physical properties of the material as a whole. These changes can be dramatic, for example causing high-temperature superconductivity in copper oxides and colossal magnetoresistance in manganese oxides. Youwen Long et al. have identified an oxide system, the perovskite LaCu3Fe4O12, in which changes in valence state occur when charge is shuffled between different cations (iron and copper) in the host structure, rather than via doping. As a result, the material can be reversibly transformed from one possessing iron in an unusually high Fe3.75+ state (partnered with fairly common Cu2+ ions) to one possessing rare Cu3+ ions. These changes are reflected in the magnetic and electronic properties of the material and, intriguingly, the material contracts slightly on being warmed through the transition. The temperature sensitivity of this effect makes it a strong candidate for technological applications.

Date: 2009
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DOI: 10.1038/nature07816

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