Low-field diamagnetic response of granular superconductors at finite temperatures

C. Auletta; G. Raiconi; R. De Luca; S. Pace

doi:10.1103/PhysRevB.49.12311

← Back to search

Low-field diamagnetic response of granular superconductors at finite temperatures

C. Auletta, G. Raiconi, R. De Luca, S. Pace

DOI 10.1103/PhysRevB.49.12311 · Physical Review B

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

Abstract

We study the low-field diamagnetic response of granular superconductors at finite temperatures by means of a simple two-dimensional Josephson-junction array. The temperature effects are taken into account by inserting white-noise current sources in parallel to the resistively shunted junction circuit models of the Josephson junctions of the network. By this analysis we argue that a simplified one-dimensional description of the equivalent circuit, proposed by the authors for cylindrical granular superconductors, is still valid even in the presence of thermally activated flux jumps. A flux-creep picture for intergranular flux motion follows.