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Publication
Physical Review Letters
Paper
Quantum critical phenomena in charged superconductors
Abstract
We study the effect of Coulomb interactions on the onset of superconductivity with increasing intergrain coupling in granular systems at T=0. We show that in three dimensions (3D) the onset transition is described by Euclidean scalar electrodynamics, and so can be either first or second order, depending on parameters. A renormalization-group analysis indicates that in 2D the transition can either be first order, or second order with 3D-XY-like critical behavior. In 1D Coulomb forces are shown to destroy the superconducting state. © 1988 The American Physical Society.