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Increase of Magnetic Transition Temperatures by Reduction of Local Disorder for Perovskite Manganites

Published online by Cambridge University Press:  01 February 2011

B. Dabrowski ,
O. Chmaissem ,
J. Mais ,
S. Kolesnik ,
J.D. Jorgensen  and
S. Short
B. Dabrowski
Affiliation:
Department of Physics, Northern Illinois University, DeKalb, IL 60115
O. Chmaissem
Affiliation:
Department of Physics, Northern Illinois University, DeKalb, IL 60115
J. Mais
Affiliation:
Department of Physics, Northern Illinois University, DeKalb, IL 60115
S. Kolesnik
Affiliation:
Department of Physics, Northern Illinois University, DeKalb, IL 60115
J.D. Jorgensen
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, IL 60439
S. Short
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, IL 60439
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Abstract

We report the synthesis of Sr1-xCaxMnO3 and La0.5Ba0.5MnO3 perovskites over extended cation and oxygen composition ranges and describe the dependence of their phase stability on the tolerance factor t = t(x,T,σ) that is a function of composition, temperature, and oxygen content. We show that magnetic transition temperatures depend strongly on the tolerance factor and charge disorder while dependence on the structural disorder is less important. By reducing charge and structural disorder we have significantly increased the Curie and Neel temperatures for perovskite manganites.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 718: Symposium D – Perovskite Materials , 2002 , D5.8
Copyright
Copyright © Materials Research Society 2002

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