Physics – Condensed Matter – Superconductivity
Scientific paper
1999-06-16
Physics
Condensed Matter
Superconductivity
18 pages
Scientific paper
10.1103/PhysRevB.61.6966
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.
Fisher Matthew P. A.
Senthil T.
Vishveshwara Smitha
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