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Author Quenneville, E. ♦ Meunier, M. ♦ Yelon, A. ♦ Morin, F.
Sponsorship (US)
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Publisher The American Physical Society
Language English
Subject Keyword PHYSICS OF ELEMENTARY PARTICLES AND FIELDS ♦ ELECTRIC CONDUCTIVITY ♦ PHYSICS ♦ POLARONS ♦ THIN FILMS ♦ TRANSPORT
Abstract Electrical conductivity measurements on La{sub 0.5}Sr{sub 0.5}MnO{sub 3} (LSM5) thin films as a function of temperature are presented. These are used to demonstrate that the electronic transport in LSM5 is well described by the Emin--Holstein adiabatic small polaron model. Measurements have also been performed on bulk samples. Even if the conductivity behaves somewhat differently in the latter case, the same polaronic model still applies. The polaron densities extracted from conductivity measurements are very similar, ranging from 7 to 8 x 10{sup 21}cm{sup -3} for thin films and are 9.1 x 10{sup 21}cm{sup -3} for bulk samples. These results agree quite well with the nominal polaron density for LSM5, 8.4 x 10{sup 21}cm{sup -3}. We have also derived important quantities for transport in LSM5. For thin films, we obtained hopping energies, W{sub H}, ranging between 73 and 99 meV and almost constant, at 34 meV, for bulk samples. By fitting conductivity measurements from 50 to 1123 K, we also find the zero point interaction constant, {gamma}{sub 0}, to be 0.35 in thin films. These conductivity results are compared with the literature. {copyright} 2001 American Institute of Physics.
ISSN 00218979
Educational Use Research
Learning Resource Type Article
Publisher Date 2001-08-15
Publisher Place United States
Journal Journal of Applied Physics
Volume Number 90
Issue Number 4


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