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 |
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Hauptverfasser: | , , |
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. |
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ISSN: | 1051-8223 1558-2515 |
DOI: | 10.1109/TASC.2005.849700 |