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Order-parameter symmetry and mode-coupling effects at dirty superconducting quantum phase transitions
Sknepnek R., Vojta T.,
Published in American Physical Society
Volume: 70
Issue: 10
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.
About the journal
JournalData powered by TypesetPhysical Review B - Condensed Matter and Materials Physics
PublisherData powered by TypesetAmerican Physical Society
Open AccessNo