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Author Gupta, A. ♦ Gong, G. Q. ♦ Xiao, G. ♦ Duncombe, P. R. ♦ Lecoeur, P. ♦ Trouilloud, P. ♦ Wang, Y. Y. ♦ Dravid, V. P. ♦ Sun, J. Z.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ PEROVSKITES ♦ MAGNETORESISTANCE ♦ LANTHANUM OXIDES ♦ CADMIUM COMPOUNDS ♦ STRONTIUM COMPOUNDS ♦ MANGANATES ♦ GRAIN BOUNDARIES ♦ TRANSITION TEMPERATURE ♦ FERROMAGNETIC MATERIALS ♦ DOMAIN STRUCTURE ♦ THIN FILMS
Abstract The role of grain boundaries in the magnetoresistance (MR) properties of the manganites has been investigated by comparing the properties of epitaxial and polycrystalline films of La{sub 0.67}{ital D}{sub 0.33}MnO{sub 3{minus}{delta}} ({ital D}=Ca,Sr, or vacancies). While the MR in the epitaxial films is strongly peaked near the ferromagnetic transition temperature and is very small at low temperatures, the polycrystalline films show large MR over a wide temperature range down to 5 K. The results are explained in terms of switching of magnetic domains in the grains and disorder-induced canting of Mn spins in the grain-boundary region. {copyright} {ital 1996 The American Physical Society.}
ISSN 01631829
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-12-01
Publisher Place United States
Journal Physical Review, B: Condensed Matter
Volume Number 54
Issue Number 22


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