A novel superconducting glass state in disordered thin films in Clogston limit

Details A novel superconducting glass state in disordered thin films in Clogston limit A novel superconducting glass state in disordered thin films in Clogston limit

1999-06-16

arxiv.org/abs/cond-mat/9906257v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Latex, 39 pages, 2 figures included; to appear in Int. J. Mod. Phys. B

Scientific paper

10.1142/S0217979299002356

A theory of mesoscopic fluctuations in disordered thin superconducting films in a parallel magnetic field is developed. At zero temperature, the superconducting state undergoes a phase transition into a state characterized by superfluid densities of random signs, instead of a spin polarized disordered Fermi liquid phase. Consequently, the ground state belongs to the same universality class as the 2D XY spin glass. As the magnetic field increases further, mesoscopic pairing states are nucleated in an otherwise homogeneous spin polarized disordered Fermi liquid. The statistics of these pairing states is universal depending on the sheet conductance of the 2D film.

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