Strong Electron Correlation Effects in Copper Oxides

Nikolai M. Plakida
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Nikolai M. Plakida: Joint Institute for Nuclear Research

A chapter in Correlations, Coherence, and Order, 1999, pp 237-293 from Springer

Abstract: Abstract In developing the theory of the high-temperature superconductivity it is necessary to solve the two most important problems which are definitely interrelated: what is the nature of the normal state for electrons in oxide compounds and what is the mechanism of formation of the superconducting phase? It is generally accepted that electron correlations constitute a key issue in the explanation of many “unconventional” physical properties of copper oxides. After a brief discussion of experimental results which prove this statement we shall introduce theoretical models (phenomenological and microscopic ones) to treat strong electron correlations in Cu02 planes. By employing the microscopic models (the p — d-like Hubbard model and the one-band t —.J model) we present the results of calculations for the optical conductivity, the dynamic spin susceptibility, the electronic spectrum and the superconducting pairing of quasiparticles. It is shown that dynamic spin fluctuations, resulting from strong electron correlations in the models, heavily renormalize the quasiparticle spectrum which can explain many unconventional properties of copper oxides in the normal state and also naturally ensure the d-wave superconducting pairing observed experimentally.

Keywords: Hubbard Model; Optical Conductivity; Spin Fluctuation; Knight Shift; Spin Susceptibility (search for similar items in EconPapers)
Date: 1999
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Persistent link: https://EconPapers.repec.org/RePEc:spr:sprchp:978-1-4615-4727-3_8

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DOI: 10.1007/978-1-4615-4727-3_8

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