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Physics Letters

Microwave-induced D.C. voltages across Josephson junctions

D. N. Langenberg, Douglas J. Scalapino, Barry N. Taylor, R.E. Eck

Published Apr 1, 1966• 62 citations
Publisher
DOI
10.1016/0031-9163(66)91114-0

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Superconductor Science and Technology•Jan 10, 2002•0 citations
We have studied the power dependence of the microwave-induced dc voltages across "unbiased" Pb---Pb oxide---Pb Josephson tunnel junctions and found a systematic dependence. We have also found that the Josephson effect in the form of induced quantum voltages was observable in a large dc magnetic field as high as 0.5 kG, about one-half of the Hc2{H}_{c2}Hc2​ of the superconducting Pb film.
Quantized voltage across the unbiased terminals of a bicrystal YBa 2 Cu 3 O 7 dc SQUID exposed to microwave radiation has been observed at 77 K. Using this voltage as an indication of the microwave power coupled to the junctions, we identified three distinct regions in the I – V curves as the microwave power was tuned, similar to those reported for low- T c SQUID. Pronounced double period steps were observed when the microwave radiation power was high enough to suppress the dc Josephson current completely. Half-integer steps also appeared as the applied dc-magnetic flux was close to half-integers of flux quanta. The experimental phenomenon was explained based on the resistively shunted Josephson junction model.