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arXiv:cond-mat/0408065 · Springer eBooks

Direct Measurements of Tunable Josephson Plasma Resonance in the L-Set

Mika A. Sillanpää, Leif Roschier, Pertti Juhani Hakonen

Published May 29, 2006• 0 citations
arXivHTMLPDF
DOI
10.1007/0-387-31143-2_6

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The speed of Josephson circuits such as those required for rapid single flux quantum logic is limited by the Josephson plasma frequency, /spl omega//sub p/, which (with few exceptions) increases monotonically with increasing critical current density, J/sub c/. Here we describe a new technique for directly measuring /spl omega//sub p/, using the current-voltage characteristics of a simple structure based on externally-shunted, series-connected tunnel junctions. We present both experimental and theoretical demonstrations of the technique and describe its application to the determination of the junction capacitance, a property poorly characterized for high-J/sub c/ junctions.
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