Abstract
The relevance of the lattice-mediated superconducting pairing in a system of quasilocalized polarons dressed by local lattice deformations is considered. The spin correlations are taken into account using thet-J model expressed in terms of holon and spin operators. The Holstein-like Hamiltonian for holons with the transport term depending on spin correlations is transformed by the generalized Lang-Firsov transformation which implies the spread of the charge and the deformations to the nearest neighbours. The analytical formula for the superconducting transition temperatureT c is deduced using the assumption of an extremely narrow polaron band. The hole-concentration dependence ofT c and the isotope exponent are discussed using the classical approximation for incommensurate spiral spin correlations.
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This work was supported by the Grant Agency of the Czech Republic, project No. 202/96/0864.
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Loos, J., Straka, J. Possible relevance of lattice effects in high-T c superconductors. Czech J Phys 47, 825–834 (1997). https://doi.org/10.1023/A:1021154721687
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DOI: https://doi.org/10.1023/A:1021154721687