Abstract
The reverse isotope effect on the superconducting transition temperature of PdH, PdD, and PdT is quantitatively explained by incorporating the effects of the zero-point motion of Pd and H on the electronic structure of the system. The vibration of the Pd atom smears out its charge distribution in space. The corresponding potential is felt by the vibrating H, D, and T atoms. This interaction modelled in terms of the Debye-Waller mechanism is shown to have a significant effect on the electron-phonon coupling constant. The anharmonicities in the phonon spectra and the electronic structure influenced by the vibrating atoms play a major role in the observed isotope dependence of the transition temperature.
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