Physics – Condensed Matter – Superconductivity
Scientific paper
2003-01-28
International Journal of Modern Physics, B17(18-20), 2003, pp. 3315-3318
Physics
Condensed Matter
Superconductivity
2 pages, 1 figure, invited paper at the New3SC-4 Conference (San Diego, CA, January 2003)
Scientific paper
Most of the proposed models of high-temperature superconductivity (HTSC) are based on the short-range electron-electron correlations or/and on a short-range electron-phonon interaction. However, in the cuprates the screening is poor due to a low carrier density, layered crystal structure, and high ionicity of the lattice. We develop further the bipolaron model of HTSC, which explicitly takes into account the long-range origin of all interactions. The long-range electron-phonon (Froehlich) interaction binds carriers into real space pairs (small bipolarons) with surprisingly low mass but sufficient binding energy, while the long-range Coulomb repulsion keeps them from forming larger clusters. The model has explained many key features of cuprates. Here it is shown that real-space pairing takes place in many cuprates at variance with some (incorrect) criteria of the BCS-BEC crossover.
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