Superconducting transition in disordered granular superconductors in magnetic fields
arXiv:cond-mat/0510380 · doi:10.1103/PhysRevB.74.054510
Abstract
Motivated by a recent argument that the superconducting (SC) transition field of three-dimensional (3D) disordered superconductors with granular structure in a nonzero magnetic field should lie above in low limit, the glass transition (or, in 2D, crossover) curve of disordered quantum Josephson junction arrays is examined by incorporating SC fluctuations. It is found that the glass transition or crossover in the granular materials can be described on the same footing as the vortex-glass (VG) transition in amorphous-like (i.e., nongranular) materials. In most of 3D granular systems, the vanishing of resistivity upon cooling should occur even above , while the corresponding sharp drop of the resistivity in 2D case may appear only below as a result of an enhanced quantum fluctuation.
Accepted for publication in Phys. Rev. B. The content of sec.3 in v.2 was removed from here and presented more extensively in a separate paper (cond-mat/0606522) where the argument of nonsuperconducting vortex-glass in cond-mat/0512432 is shown to be false
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