Isotope Effect in d-Wave Superconductors
H. -B. Schüttler, C. -H. Pao
DOI 10.1103/PhysRevLett.75.4504 · Physical Review Letters
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Abstract
Based on recently proposed antiferromagnetic 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 strong anharmonic multiple-well lattice tunneling modes can. Our results thus point towards a strongly enhanced effective electron-phonon coupling and a possible breakdown of Migdal-Eliashberg theory in the cuprates.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (Y,Pr)Ba2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
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