Magnetotransport in perovskite series La{sub n{minus}nx}Ca{sub 1+nx}Mn{sub n}O{sub 3n+1} ferromagnets
- Department of Crystalline Materials Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-01 (Japan)
The perovskite series La{sub n{minus}nx}Ca{sub 1+nx}Mn{sub n}O{sub 3n+1} (n=2,3, and {infinity}) composed of n layers of MnO{sub 2} is a colossal magnetoresistance (CMR) ferromagnet. Results on the transport properties of epitaxial a-axis thin-film samples with a fixed carrier concentration (x=0.3) have indicated that a reduction in the number of layers results in systematic changes in the various features. These include an increase in resistivity, a decrease in the resistivity peak temperature T{sub c}{sup {rho}} corresponding to the metal-insulator transition, an enhancement of the maximum MR near T{sub c}{sup {rho}}, and an increase in the low-temperature intrinsic MR. In order to explain the variation in these features with the number of MnO{sub 2} layers, it is necessary to take both c-axis transfer interaction and two-dimensional spin fluctuation into account. {copyright} {ital 1998} {ital The American Physical Society}
- OSTI ID:
- 565911
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 2 Vol. 57; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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