Unconventional pairing symmetry of layered superconductors caused by acoustic phonons
A. S. Alexandrov
DOI 10.1103/PhysRevB.77.094502 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
An inevitable anisotropy of sound velocity in crystals makes the phonon-mediated attraction of electrons nonlocal in space providing unconventional Cooper pairs with a nonzero orbital momentum. As a result of this anisotropy, quasi-two-dimensional charge carriers weakly coupled with acoustic phonons undergo a quantum phase transition from a conventional s-wave to an unconventional d-wave superconducting state with less carriers per unit cell. In the opposite strong-coupling regime, rotational symmetry breaking appears as a result of a reduced Coulomb repulsion between unconventional bipolarons dismissing thereby some constraints on unconventional pairing in the Bose-Einstein condensation limit. The conventional acoustic phonons, and not superexchange, are shown to be responsible for the d-wave symmetry of cuprate superconductors, where the on-site Coulomb repulsion is large.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
Similar papers
Anharmonic phonons and high-temperature superconductivity
similarity 0.97Vincent H. Crespi & Marvin L. Cohen
Source status unknown — claims are unverified
Effects of strong Coulomb correlations on the phonon-mediated superconductivity: A model inspired by Copper oxides
similarity 0.97Ju H. Kim & Zlatko Tešanović
Source status unknown — claims are unverified
Spin-phonon coupling and q-dependence of spin excitations and high-Tc superconductivity from band models
similarity 0.96T. Jarlborg
Source status unknown — claims are unverified
Interplay between band structure and gap symmetry in a two-dimensional anisotropic superconductor
similarity 0.96A. J. Fedro & D. D. Koelling
Source status unknown — claims are unverified
Electron-phonon interactions in the high-temperature superconductors
similarity 0.96Ju H. Kim et al.
Source status unknown — claims are unverified
Occurrence of d-Wave Pairing in the Phonon-Mediated Mechanism of High Temperature Superconductivity in Cuprates
similarity 0.96Hiroshi Kamimura et al.
Source status unknown — claims are unverified