Microwave-frequency vortex dynamics in YBCO grain boundaries

H. Xin, D. E. Oates, G. Dresselhaus, M. S. Dresselhaus

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


We report measurements and modeling of microwave-frequency vortex dynamics in YBCO grain boundaries that are modeled as long Josephson junctions by numerically solving the sine-Gordon equation. YBCO bicrystal grain boundaries with misorientation angles from 2 to 24° have been studied experimentally using microwave resonator measurement techniques. Comparison between the measured and calculated microwave impedance and the harmonic generation of the 24° grain boundaries indicates that the 24° grain boundaries are weakly coupled long Josephson junctions. The corresponding results of lower angle grain boundaries are also presented. A transition from strong-coupled single-crystal-like behavior to weak-coupled Josephson-junction-like behavior has been observed in a 10° grain boundary between 55 and 75 K. The physics of Josephson-vortex dynamics and its impact on the microwave properties of superconducting thin films are discussed.

Original languageEnglish (US)
Pages (from-to)637-649
Number of pages13
JournalJournal of Superconductivity
Issue number5
StatePublished - 2001


  • Grain boundaries
  • Microwave properties
  • Surface resistance
  • Vortex dynamics

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Physics and Astronomy (miscellaneous)


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