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.
Temperature stability of SNIS Josephson arrays between 4.2 K and critical temperature in cryocooler / Sosso, A.; Trinchera, B.; Monticone, E.; Fretto, M.; Durandetto, P.; Lacquaniti, V.. - In: IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY. - ISSN 1051-8223. - 25:3(2014), pp. 1-4. [10.1109/TASC.2014.2383173]
|Titolo:||Temperature stability of SNIS Josephson arrays between 4.2 K and critical temperature in cryocooler|
|Data di pubblicazione:||2014|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1109/TASC.2014.2383173|
|Appare nelle tipologie:||1.1 Articolo in rivista|
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