Shapiro steps on current-voltage curves of dc SQUIDs

We have studied in detail the current-voltage (I-V) curves of dc SQUIDs in the presence of rf fields in the frequency range 2–18 GHz. Strong voltage locking at half-integral as well as the usual integral Shapiro step spacing is observed when the applied dc-magnetic flux is close to half-integral num...

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Veröffentlicht in:	J. Appl. Phys.; (United States) 1988-07, Vol.64 (1), p.242-245
Hauptverfasser:	VANNESTE, C, CHI, C. C, GALLAGHER, W. J, KLEINSASSER, A. W, RAIDER, S. I, SANDSTROM, R. L
Format:	Artikel
Sprache:	eng
Schlagworte:	420201 - Engineering- Cryogenic Equipment & Devices Applied sciences CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS DATA ELECTRIC CONDUCTIVITY ELECTRICAL PROPERTIES ELECTRONIC EQUIPMENT Electronics Exact sciences and technology EXPERIMENTAL DATA FLUXMETERS INFORMATION MAGNETIC FLUX MEASURING INSTRUMENTS MICROWAVE EQUIPMENT NUMERICAL DATA PHYSICAL PROPERTIES Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices SIMULATION SQUID DEVICES SUPERCONDUCTING DEVICES
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Zusammenfassung:	We have studied in detail the current-voltage (I-V) curves of dc SQUIDs in the presence of rf fields in the frequency range 2–18 GHz. Strong voltage locking at half-integral as well as the usual integral Shapiro step spacing is observed when the applied dc-magnetic flux is close to half-integral numbers of flux quanta. Numerical simulations are in excellent agreement with the experimental I-V curves. The half-integral steps are found to be associated with the flip-flop between two adjacent fluxoid states of the SQUID synchronized to the rf field.
ISSN:	0021-8979 1089-7550
DOI:	10.1063/1.341471