Grain-boundary effects on the magnetoresistance properties of perovskite manganite films

Journal Article · Sun Dec 01 04:00:00 EST 1996 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.54.R15629· OSTI ID:399846

Gupta, A ^[1]; Gong, G Q ^[2]; Xiao, G ^[1]; Duncombe, P R; Lecoeur, P; Trouilloud, P ^[1]; Wang, Y Y; Dravid, V P ^[3]; Sun, J Z ^[1]

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1. IBM Research Division, T. J. Watson Research Center, Yorktown Heights, New York 10598 (United States)
2. Department of Physics, Brown University, Providence, Rhode Island 02912 (United States)
3. Materials Science and Engineering Department, Northwestern University, Evanston, Illinois 60208 (United States)

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.}

• DOE Contract Number: FG02-92ER45475
• OSTI ID: 399846
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 22 Vol. 54; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CADMIUM COMPOUNDS
DOMAIN STRUCTURE
FERROMAGNETIC MATERIALS
GRAIN BOUNDARIES
LANTHANUM OXIDES
MAGNETORESISTANCE
MANGANATES
PEROVSKITES
STRONTIUM COMPOUNDS
THIN FILMS
TRANSITION TEMPERATURE