Abstract

Material research on perovskite-type oxides (ABO3) has been driven by the recognition of their unique properties primarily attributed to the presence of oxygen octahedron (BO6). Since 2003, the discovery of strong coupling in TbMnO3 and BiFeO3 has stimulated new interests in understanding the relationship between magnetic and electric properties in perovskites. In this article, we report our recent work on the magnetic superexchange interaction and charge formation in copper-doped LaFeO3 using high-temperature neutron diffraction and thermoelectric measurements. In situ neutron diffraction measurements show a loss of antiferromagnetic ordering above 450°C. With an increase in Cu content, the (Fe, Cu)-O bond length decreases and the (Fe, Cu)-O-(Fe, Cu) bond angle increases, which leads to an enhancement of the Fe-O-Fe superexchange interaction. Thermoelectric and electrical measurements show that the formation of electron holes in Cu-doped LaFeO3 is a thermally activated process with two distinct regions with a transition temperature near 450°C, in congruence with the magnetic measurements. Our work show that Cu is in 3+ state in La (Fe,Cu)O3 at room temperature, resulting in the maximum super exchange interaction between Fe3+ ions.

Department(s)

Chemistry

Second Department

Physics

Third Department

Materials Science and Engineering

Publication Status

Full Access

Comments

National Science Foundation, Grant DMR-1006113

International Standard Serial Number (ISSN)

1551-2916; 0002-7820

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2024 Wiley, All rights reserved.

Publication Date

01 Jun 2016

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