The Isotope Effect in d-Wave Superconductors
Abstract
Based on recently proposed anti-ferromagnetic spin fluctuation exchange models for dx2-y2-superconductors, we show that coupling to harmonic phonons cannot account for the observed isotope effect in the cuprate high-Tc materials, whereas coupling to strongly anharmonic multiple-well lattice tunneling modes can. Our results thus point towards a strongly enhanced effective electron-phonon coupling and a possible break-down of Migdal-Eliashberg theory in the cuprates.
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