Abstract
The present novel approach consists of two stages: in the first stage the many-electron states of a CuO6 octahedron or a CuO5 pyramid are calculated by the first-principles variational method, by taking into account the local distortions of a CuO6 octahedron or a CuO5 pyramid. In the second stage a metallic state is constructed in the presence of the local AF ordering constructed by the localized spins. In this metallic state the local distortions are treated in the mean field approximation, so that a “pseudopolaronic effect” is taken into account. Based on this approach, the hole-concentration dependence of T c and the isotope effect are calculated for LSCO, and compared with experimental results. This approach leads to d-wave pairing mechanism.
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Kamimura, H., Hamada, T., Matsuno, Si. et al. A Novel Approach to the Polaronic Metallic State of Cuprate Superconductors and the d-Wave Pairing Mechanism. Journal of Superconductivity 15, 379–385 (2002). https://doi.org/10.1023/A:1021078415473
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DOI: https://doi.org/10.1023/A:1021078415473