Order-parameter symmetry and mode-coupling effects at dirty superconducting quantum phase transitions

Rastko Sknepnek, Thomas Vojta, Rajesh Narayanan

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

We derive an order-parameter field theory for a quantum phase transition between a disordered metal and an exotic (non-s-wave) superconductor. Mode coupling effects between the order parameter and other fermionic soft modes lead to an effective long-range interaction between the anomalous density fluctuations which is reflected in singularities in the free energy functional. However, this long-range interaction is not strong enough to suppress disorder fluctuations. The asymptotic critical region is characterized by run-away flow to large disorder. For weak coupling, this asymptotic region is very narrow. It is preempted by a wide crossover regime with mean-field critical behavior and, in the p-wave case, logarithmic corrections to scaling in all dimensions.

Original languageEnglish
Article number104514
Number of pages8
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume70
Issue number10
DOIs
Publication statusPublished - 23 Sep 2004

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