Metal-superconductor transition at zero temperature: A case of unusual scaling

Details Metal-superconductor transition at zero temperature: A case of unusual scaling Metal-superconductor transition at zero temperature: A case of unusual scaling

1997-06-05

arxiv.org/abs/cond-mat/9706044v2

Phys. Rev. Lett. vol. 79, pp. 3042-3045 (1997)

Physics

Condensed Matter

Superconductivity

4 pp., no figs, final version as published

Scientific paper

10.1103/PhysRevLett.79.3042

An effective field theory is derived for the normal metal-to-superconductor quantum phase transition at T=0. The critical behavior is determined exactly for all dimensions d>2. Although the critical exponents \beta and \nu do not exist, the usual scaling relations, properly reinterpreted, still hold. A complete scaling description of the transition is given, and the physics underlying the unusual critical behavior is discussed. Quenched disorder leads to anomalously strong T_c-fluctuations which are shown to explain the experimentally observed broadening of the transition in low-T_c thin films.

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