Key pairing interaction in layered doped ionic insulators

Details Key pairing interaction in layered doped ionic insulators Key pairing interaction in layered doped ionic insulators

2010-08-16

arxiv.org/abs/1008.2735v1

Phys. Rev. Lett. 105 (2010) 226408

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

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 Fr\"{o}hlich 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.

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