Physics – Condensed Matter
Scientific paper
1995-11-30
Physics
Condensed Matter
Submitted for publication some weeks ago, four pages revtex, four figures available upon request to varelogi@venus.roma1.infn.
Scientific paper
We point out that in two-dimensional systems like high-$T_c$ superconductors, an isotropic s-wave electron-phonon interaction in the momentum decoupling regime leads to either s or d-wave superconductivity depending on the conventional values of the Coulomb pseudopotential. It is therefore possible that $YBa_2Cu_3O_7$ is an anisotropic d-wave and $Bi_2Sr_2CaCu_2O_8$ an anisotropic s-wave superconductor both having the same pairing interaction and similar $T_c$'s. A transition from s-wave to d-wave superconductivity may also be possible by adjusting the doping.
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