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d-wave induced zero-field resonances in dc pi-superconducting quantum interference devices.

B Chesca1, R R Schulz, B Goetz

  • 1Experimentalphysik VI, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, D-86135 Augsburg, Germany.

Physical Review Letters
|May 15, 2002
PubMed
Summary

Researchers observed anomalous resonance currents in high-temperature (high- T(c)) direct current (dc) pi superconducting quantum interference devices (SQUIDs). This provides evidence for d-wave symmetry influencing Josephson junction voltage states at high frequencies.

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Area of Science:

  • Condensed Matter Physics
  • Superconductivity
  • Quantum Electronics

Background:

  • A direct current pi superconducting quantum interference device (dc pi SQUID) features a superconducting ring with two Josephson junctions.
  • One junction exhibits a pi phase shift due to factors like the d-wave pairing symmetry in high-temperature cuprates.

Purpose of the Study:

  • To investigate the expected anomalous resonance currents in the transport characteristics of dc pi SQUIDs.
  • To provide evidence for the influence of d-wave symmetry on the voltage state of Josephson junctions.

Main Methods:

  • Fabrication and characterization of high-temperature dc pi SQUIDs.
  • Measurement of transport characteristics and identification of resonance currents at GHz frequencies.

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Main Results:

  • Observed anomalous resonance currents in high-temperature dc pi SQUIDs.
  • Demonstrated the influence of d-wave symmetry on Josephson junction voltage states.

Conclusions:

  • The study confirms the presence of anomalous resonance currents in dc pi SQUIDs.
  • Provides experimental evidence linking d-wave symmetry to the voltage state of Josephson junctions at high frequencies (tens of GHz).