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On the theory of diamagnetism in granular superconductors

M. V. Feigelman·L. B. Ioffe
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Abstract

We study a highly disordered network of superconducting granules linked by weak Josephson junctions in magnetic field and develop a mean field theory for this problem. The diamagnetic response to a slow {\it variations} of magnetic field is found to be analogous to the response of a type-II superconductor with extremely strong pinning. We calculate an effective penetration depth $λ_g$ and critical current $j_c$ and find that both $λ_g^{-1}$ and $j_c$ are non-zero but are strongly suppressed by frustration.

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M. V. Feigelman, L. B. Ioffe. 1994-05-21. On the theory of diamagnetism in granular superconductors. https://doi.org/10.1103/physrevlett.74.3447

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