engleski

The use of hydrogen as a probe to study quantum interference at defects in metallic glasses

The electrical resistivity and the magnetic susceptibility of hydrogen-doped disordered Zr-Ni alloys have been measured at temperatures between 1.7K and 300K and in magnetic fields up to 6T for various dopant concentrations. The temperature and magnetic field dependence of the measured properties have been analysed using the theoretical models of weak-localization and electron-electron interaction in disordered three- dimensional conductors. Doping the samples with hydrogen increases the disorder. Thus, we have found that hydrogen strongly enhances quantum interference at defects. As a result the effective diffusion constant of the electrons and the screening of the Coulomb interaction are reduced. This leads to an increase in resistivity, suppression of the superconducting transition temperature, and to enhanced spin susceptibility at low temperatures. The Maki-Thompson interaction as well as the spin-orbit contribution to the magnetoresistivity are also depressed.

weak-localisation ; electron-electron interaction ; disorder ; metallic glass ; superconductivity ; galvanomagnetic properties ; hydrogen

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