Central peak position in magnetization loops of high-$T_c$ superconductors

Details Central peak position in magnetization loops of high-$T_c$ superconductors Central peak position in magnetization loops of high-$T_c$ superconductors

1998-12-14

arxiv.org/abs/cond-mat/9812222v1

Physics

Condensed Matter

Superconductivity

$ pages, 6 figures

Scientific paper

10.1103/PhysRevLett.82.2947

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.

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