Key pairing interaction in layered doped ionic insulators

Abstract

A controversial issue on whether the electron-phonon interaction (EPI) is crucial for high-temperature superconductivity or it is weak and inessential has remained one of the most challenging problems of contemporary condensed matter physics. We employ a continuum RPA approximation for the dielectric response function allowing for a selfconsistent semi-analytical evaluation of the EPI strength, electron-electron attractions, and the carrier mass renormalisation in layered high-temperature superconductors. We show that the Fröhlich EPI with high-frequency optical phonons in doped ionic lattices is the key pairing interaction, which is beyond the BCS-Migdal-Eliashberg approximation in underdoped superconductors, and it remains a significant player in overdoped compounds.

4 pages, 4 figures

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Cited by in corpus (10)

• High Temperature Superconductivity: the explanation
• Theory of High Temperature Superconductivity in Doped Polar Insulator
• Observation of polaritons in Bi2Sr2CaCu2O8+x single crystals
• Isotope effects in high-Tc cuprate superconductors: Ultimate proof for bipolaron theory of superconductivity
• Superlight small bipolarons from realistic long-range Coulomb and Fröhlich interactions
• High temperature superconductivity from realistic long-range Coulomb and Fröhlich interactions
• Metastable electron-pair states in a two-dimensional crystal
• Strong-coupling superconductivity beyond BCS and the key pairing interaction in cuprate superconductors
• Effect of screening of the electron-phonon interaction on the temperature of Bose-Einstein condensation of intersite bipolarons
• Contribution of interband effects caused by long-wavelength transverse optical phonons to electron-phonon coupling in doped polar insulators