Abstract
Operation of a superconducting quantum interference device (SQUID) made of stacked Josephson junction (SJJs) is analyzed numerically for a variety of junction parameters. Due to a magnetic coupling of junctions in the stack, such a SQUID has certain advantages as compared to an uncoupled multi-junction SQUID. Namely, metastability of current–flux modulation can be reduced and a voltage–flux modulation can be improved if junctions in the stack are phase locked. Optimum operation of the SQUID is expected for moderately long, strongly coupled SJJs. A possibility of making a SJJ SQUID based on intrinsic Josephson junctions in high- T c superconductor is discussed.
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