Unconventional electron-phonon interactions in high-temperature superconductors
A. Bussmann-Holder, A. R. Bishop, I. Batistić
DOI 10.1103/PhysRevB.43.13728 · Physical Review B
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Abstract
The infrared absorption of the 155-cm−1 c-axis mode of YBa2Cu3O7 is calculated on the basis of an anharmonic-electron-phonon-interaction model and a large enhancement of its intensity is obtained. A double-well potential in the electron-phonon interaction gives the right order of magnitude for shifts in the bridging O(4) position in agreement with recent x-ray-absorption fine-structure data. Electron-density–two-phonon–interaction terms are derived which represent a violation of the Migdal theorem and a BCS-type superconducting state with nonlinearly enhanced electron-phonon coupling is expected together with an anisotropy of the superconducting energy gap.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O6.85 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 89 | Pressure not reported | unknown |
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