The Isotope Effect in d-Wave Superconductors

Details The Isotope Effect in d-Wave Superconductors The Isotope Effect in d-Wave Superconductors

1995-11-17

arxiv.org/abs/cond-mat/9511086v1

Physics

Condensed Matter

12 pages + 2 figures, Postscript files, all uuencoded Phys. Rev. Lett. (1995, to be published)

Scientific paper

10.1103/PhysRevLett.75.4504

Based on recently proposed anti-ferromagnetic spin fluctuation exchange models for $d_{x^2-y^2}$-superconductors, we show that coupling to harmonic phonons {\it{cannot}} account for the observed isotope effect in the cuprate high-$T_c$ materials, whereas coupling to strongly anharmonic multiple-well lattice tunneling modes {\it{can}}. Our results thus point towards a strongly enhanced {\it{effective}} electron-phonon coupling and a possible break-down of Migdal-Eliashberg theory in the cuprates.

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