Shapiro steps observed in a dc superconducting quantum interference device with multiple junctions in each arm

Chen, L.; Chen, P.; Ong, C. K.
February 2002
Applied Physics Letters;2/11/2002, Vol. 80 Issue 6, p1025
Academic Journal
A high-T[sub c] dc superconducting quantum interference device (SQUID) with three Josephson junctions (JJs) in series in each of its arms has been fabricated. Its Shapiro steps were studied using microwave (rf) radiation of 10 GHz and weak magnetic fields. The appearance of giant Shapiro steps and of some of half-integer steps was observed. Separation between the adjacent Shapiro steps could be tuned by rf magnetic fields and small external dc magnetic fields. This phenomenon was analyzed by phase locking the JJs in the SQUID. © 2002 American Institute of Physics.


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