Interaction Effects on Quasiparticle Localization in Dirty Superconductors

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We study how quasiparticle interactions affect their localization properties in dirty superconductors with broken time reversal symmetry -- for example in a magnetic field. For SU(2) spin-rotation invariant (class C) systems, the only important coupling is the spin-spin triplet interaction, which we study within a renormalization group approach. Either an additional Zeeman coupling or a complete breaking of spin rotation symmetry renders all interactions irrelevant. These two situations realize, respectively, the non-interacting unitary Anderson and the ``thermal'' (class D) universality class. Our results imply a stable metallic phase in 2D for class D. Experimental implications are discussed.
5 pages, Bull. Am. Phys. Soc. 46, 231 (2001)

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Superconductivity

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http://salesiana.dossiersoluciones.com/handle/123456789/18610

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0112044
 http://arxiv.org/abs/cond-mat/0112044

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arXiv