P. Chaddah et al., GRANULARITY EFFECTS IN THE AC MAGNETIZATION OF CERAMIC SUPERCONDUCTORS, Indian Journal of Pure & Applied Physics, 32(7), 1994, pp. 541-547
The microstructure of ceramic high temperature superconductors (HTSC)
is of superconducting grains coupled by intergranular weak-links that
are also superconducting. We have established an interesting interplay
between the hysteretic magnetic response of these two components. Our
experimental results, their qualitative understanding, and their exte
ntion to develop a technique for measuring the lower critical field, a
re presented.