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d-Wave-induced Josephson current counterflow in YBa2Cu3O7/Nb zigzag junctions.

H J H Smilde1, Ariando, D H A Blank

  • 1Low Temperature Division, Department of Applied Physics and MESA+ Research Institute, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands.

Physical Review Letters
|February 28, 2002
PubMed
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Researchers studied zigzag Josephson junctions, finding d-wave superconductivity alters current direction. These findings offer insights into high-angle grain boundaries in YBCO materials.

Area of Science:

  • Superconductivity
  • Condensed Matter Physics
  • Materials Science

Background:

  • Josephson junctions are crucial for superconducting electronics.
  • Understanding grain boundaries in high-temperature superconductors like Yttrium Barium Copper Oxide (YBa2Cu3O7) is key for device applications.
  • The d-wave nature of superconductivity in YBa2Cu3O7 influences its properties.

Purpose of the Study:

  • To investigate the behavior of Josephson currents in zigzag-shaped ramp-type junctions.
  • To explore the influence of d-wave superconductivity on Josephson current direction.
  • To utilize these junctions as model systems for studying high-angle grain boundaries.

Main Methods:

  • Fabrication of well-defined zigzag-shaped ramp-type Josephson junctions using YBa2Cu3O7 and Niobium (Nb).

Related Experiment Videos

  • Measurement of critical current dependencies on magnetic fields.
  • Analysis of Josephson current characteristics.

    • Main Results:

    • Observed magnetic field dependencies of critical currents provide evidence for d-wave-induced alternations in Josephson current direction.
    • Demonstrated that zigzag junction arrays serve as controllable model systems.
    • Estimated the upper limit of any imaginary s-wave admixture in the YBa2Cu3O7 order parameter to be below 1%.

    Conclusions:

    • The study confirms the role of d-wave superconductivity in modulating Josephson currents within complex geometries.
    • Zigzag Josephson junctions are effective for modeling pi-facet effects in high-angle grain boundaries of high-Tc superconductors.
    • The results place constraints on the admixture of other pairing states in YBa2Cu3O7 superconductivity.