1999/06/16 by Smitha Vishveshwara, S. Vishveshwara, T. Senthil +1 · 1 citation
Physics and Astronomy · #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Theoretical and Computational Physics #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.61.6966
18 pages
arxiv created 1999/06/16 · openalex publication_date 2000/03/01 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We propose a characterization of zero-temperature phases in disordered superconductors on the basis of the nature of quasiparticle transport. In three-dimensional systems, there are two distinct phases in close analogy to the distinction between normal metals and insulators: the superconducting ``metal'' with delocalized quasiparticle excitations and the superconducting ``insulator'' with localized quasiparticles. We describe experimental realizations of either phase, and study their general properties theoretically. We suggest experiments where it should be possible to tune from one superconducting phase to the other, thereby probing a novel ``metal-insulator'' transition inside a superconductor. We point out various implications of our results for the phase transitions where the superconductor is destroyed at zero temperature to form either a normal metal or a normal insulator.