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Critical currents in cylindrical, superconducting granular aluminum films

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Critical currents in cylindrical granular Al thin films of different thicknesses and electron mean free paths have been measured as a function of temperature. Experimental values of critical current tiIc in all specimens are less than the theoretical pair-breaking current. The observed temperature dependence of I c is in agreement with the theoretical one near the critical temperature, but not at lower temperatures. Effects of the manner in which the current terminals are attached to the specimen and of a deliberately applied weak spot on I c have been investigated. The dependence of I c on the rise time and the width of the pulse current has been studied.

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Authors and Affiliations

  1. Research Institute of Fundamental Information Science, Kyushu University, Fukuoka, Japan

    T. Aomine

  2. Department of Physics, Kyushu University, Fukuoka, Japan

    K. Miyake

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  1. T. Aomine
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  2. K. Miyake
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Aomine, T., Miyake, K. Critical currents in cylindrical, superconducting granular aluminum films. J Low Temp Phys 37, 85–94 (1979). https://doi.org/10.1007/BF00114058

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  • DOI: https://doi.org/10.1007/BF00114058

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