Accurate measurements of quantum voltage steps on arrays of bicrystal Josephson junctions

Quantum voltages of an array of YBa2Cu3O7 bicrystal junctions were calibrated against a programmable Josephson array voltage standard. We demonstrated that steps of the current–voltage characteristic of an array of bicrystal junctions at voltages of about 9 mV were flat over the current range of abo...

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Bibliographic Details
Published in:Applied physics letters 2002-03, Vol.80 (11), p.1972-1974
Main Authors: Klushin, A. M., Behr, R., Numssen, K., Siegel, M., Niemeyer, J.
Format: Article
Language:English
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Summary:Quantum voltages of an array of YBa2Cu3O7 bicrystal junctions were calibrated against a programmable Josephson array voltage standard. We demonstrated that steps of the current–voltage characteristic of an array of bicrystal junctions at voltages of about 9 mV were flat over the current range of about 80 μA to within six parts in 108. The coincidence of quantum voltages on the array of high-temperature superconductor junctions at 64 K and the reference voltage on the array of niobium junctions at 4.2 K was measured with an uncertainty of two parts in 108. With the same uncertainty, we revealed the coincidence of the Josephson constant KJ≡h/2e in YBa2Cu3O7 and in metallic superconductors.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.1458072