Voltage Oscillations in Percolating Superconducting Films

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We have studied the superconducting transition in thin films of Pb and Al as a function of temperature and magnetic field. Examination of the films in a transmission electron microscope shows a percolative structure with typical small loop sizes of a few thousand angstroms in Pb and a few hundred in Al. We have observed an antisymmetric voltage across the samples as a function of an external DC magnetic field. This voltage shows sharp oscillations with a periodicity of about 250 gauss in Pb and about 1000 gauss in Al. These fields correspond to about one flux quantum in elementary loops of the respective films.

Original languageEnglish
Pages (from-to)1307-1308
Number of pages2
JournalJapanese Journal of Applied Physics
Issue numberS3-2
StatePublished - Jan 1987


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