Strong coupling superconductivity and Coulomb screening

Author(s): S.B.Ota

The electron-phonon coupling constant  has been calculated for A15 compounds assuming the width of the 12 band as 80 meV.  has been found to be inversely proportional to the molecular weight. The Coulomb pseudopotential * has been found to be negative for YBa2Cu3O7-x. Similar analysis for U6X superconductors showed that * changes sign.

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