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The effect of strong Coulomb correlations on electron-phonon interactions in the copper oxides [electronic resource] : Implications for transport

Published
Washington, D.C. : United States. Dept. of Energy, 1990.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
Pages: (17 pages) : digital, PDF file
Additional Creators
Brookhaven National Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
The effects of strong Coulomb correlations on the electron-phonon interactions in the high temperature superconductors are investigated. Very strong Coulomb correlations, which are essential for creating the insulating state at half filling, lead to a suppression of charge fluctuations as the insulator is approached. This thereby significantly reduces the electron-phonon coupling. We present a self-consistent frozen phonon'' scheme which is based on a Coulomb renormalized band structure of the copper-oxygen plane as a method for calculating these effects and their influence on transport properties. The microscopic spectral function has a two-peak structure, each peak of which can be associated with primarily copper-like and oxygen-like motion. A high density of these low frequency copper-dominated modes is important, for it leads to a linear resistivity extending down to temperatures of the order of 50K. A Drude fit to low frequency ac conductivity measurements yields a decrease in the plasma frequency as the insulator is approached, as well as a relatively concentration x independent scattering time τ. The magnitude of the latter provides an upper bound on the electron-phonon coupling constant, which is found to be rather weak in accord with our calculations. The behavior of the calculated plasma frequency is also consistent with experiment and its x dependence is associated with an increase in the effective mass, due to incipient localization, as the insulator is approached. On the other hand, the calculated x independence of the electron-phonon contribution to the resistivity is not compatible with the increase observed in the total resistivity slope as the insulator is approached. This suggests that the phonon background accounts for a significant fraction of the measured resistivity slope at high x, but this contribution is not sufficient to explain the behavior at smaller x.
Report Numbers
E 1.99:bnl-46112
E 1.99: conf-901291--2
conf-901291--2
bnl-46112
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Note
Published through SciTech Connect.
01/01/1990.
"bnl-46112"
" conf-901291--2"
"DE91013333"
Symposium on the manifestations of the electron-phonon interaction in copper oxides (CuO) and related superconductors, Oaxtepec (Mexico), 11-14 Dec 1990.
Kim, J.H. . Dept. of Physics and Astrono; Auerbach, A. . Dept. of Physics; Levin, K. . James Franck Inst.; Wentzcovitch, R.
Funding Information
AC02-76CH00016
View MARC record | catkey: 14064918