RF impedance of intrinsic Josephson junction in flux-flow state with a periodic pinning potential

Y. Yamada, K. Nakajima, Koji Nakajima

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

We have investigated the dynamics of Josephson vortices interacting with electromagnetic waves in Bi2Sr2CaCu2O8+y intrinsic Josephson junction (IJJ) stacks by means of millimeter wave irradiation and numerical simulations based on coupled sine-Gordon equations while taking into account a sinusoidal form of the periodic pinning potential. The numerical simulation results for the influence of the electromagnetic waves on the flux-flow properties reveal that the periodic pinning potential induces the in-phase motion of Josephson vortices over the junctions. In order to prove from another viewpoint, we investigate RF impedance of IJJ in flux-flow state in this study. A remarkable negative real part region appears at 1st harmonic step, it means that the IJJ in flux-flow state acts as an oscillator at the negative real part region.

Original languageEnglish
Pages (from-to)1295-1297
Number of pages3
JournalPhysica C: Superconductivity and its applications
Volume468
Issue number15-20
DOIs
Publication statusPublished - 2008 Sep 15

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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