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Domain Structure and Colossal Magnetoresistance of La1−xSrxCoO3 and La1−xCaxMnO3

Published online by Cambridge University Press:  15 February 2011

Z. L. Wang ,
Jiming Zhang  and
Y. Berta
Z. L. Wang
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332
Jiming Zhang
Affiliation:
Advanced Technology Materials, Inc., 7 Commerce Drive, Danbury, CT 06810
Y. Berta
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332
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Abstract

La1−xSrxCoO3 (LSCO) and La1−xCaxMnO3 (LCMO) are a class of magnetic oxides exhibiting the colossal magnetoresistance (CMR) effect. However, the CMR ratio of LSCO is much lower than that of LCMO. Microstructure studies were carried out to understand this difference. In La0.5Sr0.5CoO3 (LSCO), an ordered, anisotropic perovskite-type structure n-LSCO was observed. The ordered structure has a tetragonal cell with a La-Co-Sr-Co- [001] layered atom distribution along the c-axis. This new structure is intrinsic for the LSCO system and is a direct result of the lattice substitution between La and Sr. The entire film is composed of [001], [010] and [100] anisotropic domains with sizes on the order of 30–200 nm. The La0 7Ca0.3MnO3 (LCMO) film, however, does not exhibit a domain structure. It is concluded that the domain structure may have negative effect on the CMR ratio.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 401: Symposium G – Epitaxial Oxide Thin Films II , 1995 , 91
Copyright
Copyright © Materials Research Society 1996

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