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Volume-Based Considerations for the Metal-Insulator Transition of CMR Oxides

Published online by Cambridge University Press:  10 February 2011

J. J. Neumeier ,
A. L. Cornelius ,
M. F. Hundley ,
K. Andres  and
K. J. McClellan
J. J. Neumeier
Affiliation:
Department of Physics, Florida Atlantic University, Boca Raton, FL 33431, USA Material Science and Technology Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
A. L. Cornelius
Affiliation:
Material Science and Technology Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
M. F. Hundley
Affiliation:
Material Science and Technology Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
K. Andres
Affiliation:
Walther-Meissner-Institut fuer Tieftemperaturforschung, Walther-Meissner-Str. 8, D85748 Garching, Germany
K. J. McClellan
Affiliation:
Material Science and Technology Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
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Abstract

The sensitivity of ρ to changes in volume which occur through: (1) applied pressure, (2) variations in temperature, and (3) phase transitions, is evaluated for some selected CMR oxides. It is argued that the changes in volume associated with (2) and (3), which are referred to as self pressures, are equivalent in magnitude to changes in volume resulting from pressures in the range of 0.18 to 0.45 GPa. Through consideration of thermal expansion and electrical resistivity data, it is shown that these self pressures are responsible for large features in the electrical resistivity and are an important component for the occurrence of the metallicity below Tc. It is suggested that this is a manifestation of a strong volume dependence of the electron phonon coupling in the CMR oxides.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 494: Symposium V – Science & Technology of Magnetic Oxides , 1997 , 293
Copyright
Copyright © Materials Research Society 1998

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References

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