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Macroscopic quantum tunneling in d-wave YBa2Cu3O7-delta Josephson junctions.

T Bauch1, F Lombardi, F Tafuri

  • 1Quantum Device Physics Laboratory, Department of Microtechnology and Nanoscience, MC2, Chalmers University of Technology, S-412 96 Göteborg, Sweden.

Physical Review Letters
|March 24, 2005
PubMed
Summary

Scientists observed macroscopic quantum tunneling (MQT) in a YBa(2)Cu(3)O(7-delta) Josephson junction (JJ). This finding demonstrates reduced dissipation in superconducting devices, crucial for quantum coherence.

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Area of Science:

  • Superconducting electronics
  • Quantum phenomena
  • Materials science

Background:

  • Superconducting Josephson junctions (JJs) exhibit an escape rate from their zero-voltage state influenced by temperature.
  • At low temperatures, this escape rate saturates due to macroscopic quantum tunneling (MQT).
  • High-temperature superconductors with d-wave symmetry present unique challenges, including low-energy quasiparticles and unconventional current-phase relations, potentially affecting the escape rate.

Purpose of the Study:

  • To investigate the influence of d-wave symmetry on macroscopic quantum tunneling (MQT) in Josephson junctions (JJs).
  • To report the first observation of MQT in a YBa(2)Cu(3)O(7-delta) grain boundary biepitaxial JJ.
  • To demonstrate that specific junction configurations can significantly reduce dissipation.

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Main Methods:

  • Fabrication of a YBa(2)Cu(3)O(7-delta) grain boundary biepitaxial Josephson junction (JJ).
  • Experimental observation and characterization of the escape rate from the zero-voltage state.
  • Analysis of the influence of macroscopic quantum tunneling (MQT) on the escape dynamics.

Main Results:

  • Successful observation of macroscopic quantum tunneling (MQT) in a YBa(2)Cu(3)O(7-delta) grain boundary biepitaxial JJ.
  • Demonstration that MQT is present despite complexities arising from d-wave symmetry.
  • Evidence that proper junction configuration can lead to significantly reduced dissipation.

Conclusions:

  • Macroscopic quantum tunneling (MQT) is observable in YBa(2)Cu(3)O(7-delta) Josephson junctions (JJs).
  • This observation confirms the potential for reduced dissipation in superconducting devices through careful junction design.
  • The findings are significant for advancing quantum coherence in superconducting systems.