Shapiro Step Response in the Coherent Josephson Flux Flow State of Bi2Sr2CaCu2O8+δ

Yu. I. Latyshev; M. B. Gaifullin; T. Yamashita; M. Machida; Yuji Matsuda

doi:10.1103/PhysRevLett.87.247007

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Shapiro Step Response in the Coherent Josephson Flux Flow State of Bi2Sr2CaCu2O8+δ

Yu. I. Latyshev, M. B. Gaifullin, T. Yamashita, M. Machida, Yuji Matsuda

DOI 10.1103/PhysRevLett.87.247007 · Physical Review Letters

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Abstract

We report the first observation of Shapiro steps in the Josephson flux flow state of Bi2Sr2CaCu2O8+δ stacked junctions. When the junction is irradiated at microwave frequencies in a strong parallel magnetic field ( H≥1T), a steep increase of the current is observed in the dc current-voltage characteristics when the external microwave frequency and the Josephson frequency are harmonically related. The existence of Shapiro steps in the Josephson flux flow state is strong evidence of coherent motion of the Josephson vortex lattice through the whole thickness of the stack.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	80	Pressure not reported	unknown