Temperature Stability of SNIS Josephson Arrays Between 4.2 K and Critical Temperature in Cryocooler
Applied Superconductivity, IEEE Transactions (2015)
摘要
Cryogen-free operation is essential to expand applications of superconductivity, is unavoidable in some special cases and, in perspective, provides a solution to the expected shortages of liquid helium. In electrical metrology applications, high-temperature operation to reduce the refrigerator size and complexity is not yet possible since arrays of Josephson junctions for voltage standard applications made with high-temperature superconductors are not presently available. The superconductor-normal metal-insulator-superconductor (SNIS) technology developed at INRIM uses low-temperature superconductors but allows operation at temperatures close to 6 K. Thus, it is interesting for the cryocooler operation of a programmable voltage standard. We report on measurements of SNIS devices cooled with a closed-cycle refrigerator and in liquid helium to test the electrical behavior and its dependence on specific fabrication parameters that can be used to optimize the temperature stability.
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关键词
cooling,high-temperature superconductors,refrigerators,superconducting junction devices,superconducting transition temperature,snis josephson junction arrays,snis device measurements,closed-cycle refrigerator,critical temperature,cryocooler,cryogen-free operation,electrical metrology applications,liquid helium,low-temperature superconductors,programmable voltage standard,refrigerator complexity reduction,refrigerator size reduction,superconductivity,superconductor-normal metal-insulator-superconductor technology,temperature stability,cryocoolers,josephson junctions,metrology,temperature effects,voltage standards,helium,high temperature superconductors,temperature measurement
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