Shapiro Step Response in the Coherent Josephson Flux Flow State of
- 27 November 2001
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 87 (24) , 247007
- https://doi.org/10.1103/physrevlett.87.247007
Abstract
We report the first observation of Shapiro steps in the Josephson flux flow state of stacked junctions. When the junction is irradiated at microwave frequencies in a strong parallel magnetic field ( ), a steep increase of the current is observed in the dc current-voltage characteristics when the external microwave frequency and the Josephson frequency are harmonically related. The existence of Shapiro steps in the Josephson flux flow state is strong evidence of coherent motion of the Josephson vortex lattice through the whole thickness of the stack.
Keywords
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