Theory of Diamagnetism in Granular Superconductors
M. V. Feigelman, L. B. Ioffe
DOI 10.1103/PhysRevLett.74.3447 · Physical Review Letters
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Abstract
We study a highly disordered network of superconducting granules linked by weak Josephson junctions in a magnetic field and develop a mean field theory for this problem. The diamagnetic response to a slow 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 λg and critical current jc and find that both λg−1 and jc are nonzero but are strongly suppressed by frustration.
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