THE INFLUENCE OF LOCALIZATION AND ELECTRON-ELECTRON INTERACTION ON THE SUPERCONDUCTING TRANSITION-TEMPERATURE IN HYDROGEN-DOPED ZR-(3D,4D) METALLIC GLASSES

Hydrogen doping has been used to vary continously the superconducting transition temperature, T(c), in Zr-3d metallic glasses. Thus, by chan ging the hydrogen concentration, the influence of electron localizatio n and electron-electron interaction on T(c) could be deduced quantitat ively. We have found that hydrogen enhances localization by providing additional centres for quasielastic scattering. The slowing of the ele ctron diffusion enhances the repulsive Coulomb interaction. Thus, a de crease of T(c) with the dopant was explained as being caused partly by an increase of the effective Coulomb potential and partly by a decrea se of the electron-phonon coupling constant.