Intermodulation distortion and Josephson vortices in YBCO bicrystal grain boundaries

Daniel E. Oates, Hao Xin, Gene Dresselhaus, Mildred S. Dresselhaus

Research output: Contribution to journalConference article

7 Scopus citations

Abstract

The properties of grain boundaries at microwave-frequencies in the high-TC materials are of interest for both practical applications and basic physics. We report the measurements of intermodulation distortion (IMD) in engineered grain boundaries in YBCO films fabricated on sapphire bicrystals with misorientation angles of 0, 2, 5, 7.5, 10 and 24°. The measurements indicate that low-angle grain boundaries are not the source of IMD in epitaxial films. We also report the microwave response of YBCO 24° bicrystal grain-boundaries to small dc magnetic fields, from 0 to 10 Oe. Peaks in the microwave loss as high as 5 times the baseline values at certain dc magnetic fields are observed. The losses result from individual Josephson vortices penetrating into the grain-boundary which is modeled as a long Josephson junction. Excellent quantitative agreement between the experimental data and the model has been obtained for the case of the increasing field.

Original languageEnglish (US)
Pages (from-to)2804-2807
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Volume11
Issue number1 III
DOIs
StatePublished - Mar 1 2001
Externally publishedYes
Event2000 Applied Superconductivity Conference - Virginia Beach, VA, United States
Duration: Sep 17 2000Sep 22 2000

Keywords

  • Grain boundaries
  • Nonlinear surface impedance
  • Vortex dynamics
  • Y-Ba-Cu-O thin films

ASJC Scopus subject areas

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

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