Observation of superconducting transition temperature oscillations in metal-nonmetal film systems
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For technetium-carbon, molybdenum-carbon, and vanadium-carbon thin-film layer structures an oscillatory dependence of the superconducting transition temperature on carbon layer thickness is found. The oscillations take place for thin metal layers (d<300 Å) and for very small thicknesses of the nonmetal film (dC<30 Å). In addition to the oscillations ofT c , oscillations of the normal-state electrical resistance remaining up to room temperature are found in the layered samples. A correlation is observed between critical temperature and resistance changes: Maxima in the curveT c (dC) correspond to minima in ρ(dC). The amplitude of the critical temperature oscillations is 10–15% of theT c value and depends on the metal layer thickness, increasing with decreasingd approximately as 1/d. Also found in the thin-film layer structures are oscillations of the critical magnetic fieldsH c⊥ andH c⊥ correlating withT c oscillations. A mutual influence of nonmetal layers located on opposite sides of the metal film was observed.
KeywordsLayer Thickness Critical Temperature Magnetic Material Metal Layer Metal Film
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