A magnetic study has been carried out on a ceramic sample, which showed a high intergrain
connectivity. AC susceptibility, dc magnetization and low-field hysteresis loop …

We have studied a simple model of granular superconductors which includes an ensemble
of simple loops formed by superconducting grains, with weak intergrain junctions. Thermally …

We calculate the current and magnetic-flux distributions in a square network of Josephson
junctions subject to an external magnetic field. Magnetic fields due to the superconducting …

In order to analyze the diamagnetic properties of sintered granular superconductors, a
circuital model consisting of a network of identical inductances (L 0) and Josephson …

The authors investigate the mechanisms of microwave (MW) losses in granular YBa 2 Cu 3
O x at weak magnetic fields in a wide temperature range. The MW losses are believed to …

Equations describing the intergrain flux creep of ceramic superconductors are derived. They
are based on the behavior of small superconducting loops closed by overdamped …

Two-dimensional square arrays of short Josephson junctions are investigated using a model
which includes both the lumped Josephson circuit elements and an equivalent inductance …

Magnetic fields produced by all currents induced in an array of Josephson junctions are
taken into account by introducing inductance coefficient specified according to the shape of …

Low field magnetization curves of cylindrical samples of high-T~granular superconductors
Page 1 Physics LettersA 164 (1992) 109—1 14 PHYSICS LETTERS A North-Holland Low …

We describe the simplest Josephson junction array models that can be adopted in studying
the diamagnetic properties of granular superconductors. We consider cylindrical …