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Effects of Lattice Distortion, Polaron Conduction and Double-Exchange Interaction on the Physical Properties of Magnetoresistive Manganites and Cobaltites

Published online by Cambridge University Press:  15 February 2011

N.-C. Yeh ,
R. P. Vasquez ,
J. Y. T. Wei ,
C-C. Fu ,
G. Beach ,
J. Huynh ,
A. V. Samoilov ,
A. V. BoriS ,
N. N. Kovaleva  and
A. V. Bazhenov
N.-C. Yeh
Affiliation:
Department of Physics, California Institute of Technology, Pasadena, CA 91125
R. P. Vasquez
Affiliation:
Center for Space Microelectronics Technology, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109
J. Y. T. Wei
Affiliation:
Department of Physics, California Institute of Technology, Pasadena, CA 91125
C-C. Fu
Affiliation:
Department of Physics, California Institute of Technology, Pasadena, CA 91125
G. Beach
Affiliation:
Department of Physics, California Institute of Technology, Pasadena, CA 91125
J. Huynh
Affiliation:
Department of Physics, California Institute of Technology, Pasadena, CA 91125
A. V. Samoilov
Affiliation:
Department of Physics, California Institute of Technology, Pasadena, CA 91125
A. V. BoriS
Affiliation:
Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow 142432, Russia
N. N. Kovaleva
Affiliation:
Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow 142432, Russia
A. V. Bazhenov
Affiliation:
Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow 142432, Russia
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Abstract

The relevance of lattice distortion, polaron conduction, and double-exchange interaction to the occurrence of colossal magnetoresistance (CMR) is investigated by comparing the physical properties of magnetoresistive manganites and cobaltites. The samples studied in this work include epitaxial films and ceramics of manganites with both A- and B-site substitution, (La0.7Ca0.3MnO3, LaMn0.7 Ni0.3O3, LaMnO.5Ni0.5O3), as well as epitaxial films and ceramics of cobaltites (La0.5Ca0.5CoO3). The structural, chemical, electrical transport, magnetic, optical properties and tunneling spectroscopy are studied. Based on our experimental results, we conclude that both double-exchange interaction and strong electron-phonon coupling due to the Jahn-Teller effect are essential to the occurrence of CMR.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 474: Symposium L – Epitaxial Oxide Thin Films III , 1997 , 145
Copyright
Copyright © Materials Research Society 1997

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References

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