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ESR investigations on Ca perovskite

Published online by Cambridge University Press:  14 March 2011

M. Chipara ,
Sy-Hwang Liou ,
C. N. Borca ,
R. Shoemaker ,
S. Adenwalla  and
P. A. Dowben
M. Chipara
Affiliation:
Department of Physics and Astronomy and the Center for Materials Research and Analysis, Behlen Laboratory of Physics, University of Nebraska, Lincoln, NE 68588-0111, USA
Sy-Hwang Liou
Affiliation:
Department of Physics and Astronomy and the Center for Materials Research and Analysis, Behlen Laboratory of Physics, University of Nebraska, Lincoln, NE 68588-0111, USA
C. N. Borca
Affiliation:
Department of Physics and Astronomy and the Center for Materials Research and Analysis, Behlen Laboratory of Physics, University of Nebraska, Lincoln, NE 68588-0111, USA
R. Shoemaker
Affiliation:
Department of Physics and Astronomy and the Center for Materials Research and Analysis, Behlen Laboratory of Physics, University of Nebraska, Lincoln, NE 68588-0111, USA
S. Adenwalla
Affiliation:
Department of Physics and Astronomy and the Center for Materials Research and Analysis, Behlen Laboratory of Physics, University of Nebraska, Lincoln, NE 68588-0111, USA
P. A. Dowben
Affiliation:
Department of Physics and Astronomy and the Center for Materials Research and Analysis, Behlen Laboratory of Physics, University of Nebraska, Lincoln, NE 68588-0111, USA
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Abstract

Electron spin resonance studies on fine powders of La0.65Ca0.35MnO3, performed in the X band, are reported. The coexistence of paramagnetic and ferromagnetic phases, in a narrow temperature range close to the Curie temperature, is observed. The electron spin resonance measurements do not support the presence of bipolarons above the Curie temperature. Temperature dependence of the ESR linewidth is governed by the hopping of polarons and the corresponding activation energy is about 150 meV above TC.

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References

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