Abstract
Direct, high-resolution observations of magnetic structures in evaporated films of the type I superconductors lead, tin, and indium are presented for a range of applied fields. The films are polycrystalline and range in thickness from 200 to 20,000 Å. the transition from the intermediate state to the mixed state is observed. The observation of the single-fluxoid vortex mixed state in the thin films with Ginzburg-Landau parameter κ less than\(1/\sqrt 2\) confirms theoretical prediction by Tinkham, Maki, and Lasher. No ordered array of vortices is observed and this is shown to be caused by the effects of the grain boundaries on the magnetic structures.
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Work supported by the National Science Foundation under Grant No. GH34125 and also under Grant No. GH33637 through the facilities of the Material Science Center, Cornell University.
The work reported here represents part of a Ph.D. thesis submitted to the faculty of Cornell University, Ithaca, New York.
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Dolan, G.J. Direct observations of the magnetic structure in thin films of Pb, Sn, and In. J Low Temp Phys 15, 111–132 (1974). https://doi.org/10.1007/BF00655630
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DOI: https://doi.org/10.1007/BF00655630