Exact analytical results are obtained for the magnetization of a superconducting thin strip with a general behavior J_c(B) of the critical current density. We show that within the critical-state model the magnetization as function of applied field, B_a, has an extremum located exactly at B_a=0. This result is in excellent agreement with presented experimental data for a YBCO thin film. After introducing granularity by patterning the film, the central peak becomes shifted to positive fields on the descending field branch of the loop. Our results show that a positive peak position is a definite signature of granularity in superconductors.
@article{arxiv.cond-mat/9812222,
title = {Central peak position in magnetization loops of high-$T_c$ superconductors},
author = {D. V. Shantsev and M. R. Koblischka and Y. M. Galperin and T. H. Johansen and P. Nalevka and M. Jirsa},
journal= {arXiv preprint arXiv:cond-mat/9812222},
year = {2009}
}