Strong coupling superconductivity and Coulomb screeningAuthor(s): S.B.Ota
The electron-phonon coupling constant ï¬ has been calculated for A15 compounds assuming the width of the ï12 band as 80 meV. ï¬ has been found to be inversely proportional to the molecular weight. The Coulomb pseudopotential ï* has been found to be negative for YBa2Cu3O7-x. Similar analysis for U6X superconductors showed that ï* changes sign.