ON THE NEGATIVE VALUES OF THE GEOMETRIC FACTORS IN THE INTRAGRANULAR FLUX-TRAPPING MODEL AND THE HYSTERESIS IN THE J(C)(B-A) DEPENDENCE OF POLYCRYSTALLINE SUPERCONDUCTORS

摘要

A mathematical reformulation of the problem of the hysteretic dependence of J(c)(B-a) in polycrystalline superconductors using the mean-value theorem was considered to obtain information on the geometric factors and percolative paths of the current through the study of different samples. In this paper the polycrystalline superconductor is regarded as a single Josephson junction whose parameters G (geometric factor) and H-0 (critical field of the junction) depend on the applied magnetic field H-a, in a way connected to the flux-trapping characteristics of the superconducting grains. [References: 11]