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 …
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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 {tau}. 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.
Symposium on the manifestations of the electron-phonon interaction in copper oxides (CuO) and related superconductors, Oaxtepec (Mexico), 11-14 Dec 1990
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Kim, J.H. (Johns Hopkins Univ., Baltimore, MD (USA). Dept. of Physics and Astronomy); Levin, K. (Chicago Univ., IL (USA). James Franck Inst.); Wentzcovitch, R. (Brookhaven National Lab., Upton, NY (USA)) & Auerbach, A. (Boston Univ., MA (USA). Dept. of Physics).The effect of strong Coulomb correlations on electron-phonon interactions in the copper oxides: Implications for transport,
article,
January 1, 1990;
Upton, New York.
(https://digital.library.unt.edu/ark:/67531/metadc1088004/:
accessed July 16, 2024),
University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu;
crediting UNT Libraries Government Documents Department.
