Flux Flow as a Function of Film Thickness in Type I Superconductor

概要

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The flux flow in type I superconducting Pb film was measured as a function of film thickness. The vortex state is stable in the films perpendicular to the magnetic field, provided the films are thinner than the critical thickness d_c which is about 9,000 Å at 4.2°K, while the theoretically predicted one is about 2,200 Å. The flux flow pattern changes gradually with the change of film thickness around d_c. The flow resistivity of the films the thickness of which is thinner than d_c is nearly linear against the magnetic field H for H|H_<c⊥><0.5. On the other hand the I-V plots in perpendicular field for films much thicker than d_c start from the origin and show characteristic "knick" much thicker than d_c start from the origin and show characteristic "knick" at certain values of current in weak fields. This result can be explained by assuming that in strong fields these films have an effective laminar structure and in weak fields they have a bundle structure in addition to an effective laminar structure. The experimental results are consistent with those of Van Gurp by a different method of measurement i.e. the flux-flow noise measurement.
社団法人日本物理学会の論文
1972-04-05