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

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arxiv cond-mat/0211519 v3 pith:G5GDIJHF submitted 2002-11-22 cond-mat.supr-con cond-mat.str-el

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

classification cond-mat.supr-con cond-mat.str-el
keywords couplingasymptoticcriticaldisordereffectsfluctuationsinteractionlong-range
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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