Direct measurement of the Josephson plasma resonance frequency from I-V Characteristics

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 di...

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Veröffentlicht in:IEEE transactions on applied superconductivity 2005-06, Vol.15 (2), p.86-89
Hauptverfasser: Kleinsasser, A.W., Johnson, M.W., Delin, K.A.
Format: Artikel
Sprache:eng
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Zusammenfassung: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.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2005.849700