Numerical research on RF induced zero-crossing steps of stacked Josephson junction in flux-flow state

Y. Yamada, Koji Nakajima

Research output: Contribution to journalArticlepeer-review

Abstract

RF responses of intrinsic Josephson junction stacks in the flux-flow state have been studied to explore vortex motion. We have reported various RF induced effects on flux-flow of Bi2Sr2CaCu2O 8+y intrinsic Josephson junctions. In a pinning free state, a remarkable zero-crossing step appears at a certain voltage on I-V curve, which is closed to the voltage V = NΦ0f, where N is the number of junction, Φ0 is the flux quantum, f is the RF frequency, respectively. It is shown that vortex motion phase-locked to external microwaves play an important role in the responses. In this report, we have carried out numerical simulation by using the coupled sine-Gordon equations in order to compare with the experimental results. The numerical simulations reveal that the alternating magnetic field of microwaves drives vortices into the stack and generates the zero-crossing step.

Original languageEnglish
Pages (from-to)820-823
Number of pages4
JournalPhysica C: Superconductivity and its applications
Volume471
Issue number21-22
DOIs
Publication statusPublished - 2011 Nov 1

Keywords

  • Flux-flow
  • Josephson junction
  • Simulation
  • Sine-Gordon equation
  • Vortex

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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