Abstract
Screening of Coulomb interactions by itinerant deuterons contributes to the enhancement of the deuteron-deuteron reaction rate in some metal deuterides and fast deuteron conductors such as PdD x , D y Na x WO 3 , SrCeO 3 :Y, Nb, and so forth. We propose that the deuteron screening mechanism also gives rise to the anomalous isotope effect in the PdD(H) system and to the increase in the superconducting transition temperature T c of D x YBa 2 Cu 3 O 7-δ . In conjunction with the currently known factors that govern superconductivity, the deuteron screening might lead to a new class of superconductors.
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