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VOLUME 59 (1994) | ISSUE 11 | PAGE 765
Paramagnetism of superconducting ceramics
Interaction between spontaneous current loops (orbital magnetic moments) induced by weak links with negative coupling energies (^-junctions) can cause paramagnetism of granular high-temperature superconductors. We show that at certain concentration of ir-junctions the system consists of infinite percolating superconducting cluster and normal regions with frozen-in magnetic field and ordered orbital magnetic moments.