The study of a critical state in superconductors having a large demagnetization factor with a 3-D analysis of neutron polarization

Magnetic flux distribution was studied in a flat superconductor having both a large demagnetization factor and a high edge barrier. Information on the distribution of the pinning magnetic flux was obtained using three-dimensi onal analysis of neutron beam polarization. The experiments were carried ou t for samples with varied thickness. The obtained experimental data agree w ith the conclusion that a new critical state structure could appear in this case. (C) 2000 Elsevier Science B.V. All rights reserved.