Abstract
Over the last decade, several competing models of high-temperature superconductivity (HTSC) were proposed, none of which have succeeded to explain high values of the superconducting critical temperature T c without adjustable parameters. Most of the proposed models are based on the short-range electron–electron interaction or/and on a short-range electron–phonon interaction. Here we propose a model of HTSC which explicitly takes into account the long-range origin of both types of interaction. Remarkably, the long-range electron–phonon interaction binds carriers into superlight real-space pairs—bipolarons—with a relatively low mass but sufficient binding energy. The model quantitatively explains high T c values without any fitting parameters and other key features of the cuprates.
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Alexandrov, A.S., Kornilovitch, P.E. Superlight Bipolarons Explain the High Superconducting Temperature. Journal of Superconductivity 15, 403–408 (2002). https://doi.org/10.1023/A:1021038701361
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DOI: https://doi.org/10.1023/A:1021038701361