Magnetoresistance in thin films and bulks of layered-perovskite La{sub 2{minus}2x}Ca{sub 1+2x}Mn{sub 2}O{sub 7}
- Department of Materials Science and Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-01 (Japan)
Epitaxial thin-film and polycrystalline bulk samples of ferromagnetic La{sub 2{minus}2x}Ca{sub 1+2x}Mn{sub 2}O{sub 7} (x=0.3) with a layered perovskite structure have been examined with respect to their magnetotransport properties. In addition to a large magnetoresistance (MR) effect at temperatures around the metal{endash}insulator transition, a-axis thin films exhibit unusual low-temperature MR behavior with apparent hysteresis in applied magnetic fields. The features in the bulk samples are a low-temperature MR effect without such hysteresis, and also an MR effect at high temperatures well above the metal{endash}insulator transition temperature. The unique MR behavior depending on the sample form would reflect an anisotropic nature in the layered-perovskite ferromagnet with two-dimensional Mn-O networks. {copyright} {ital 1997 American Institute of Physics.}
- OSTI ID:
- 544512
- Journal Information:
- Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 17 Vol. 70; ISSN APPLAB; ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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