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Atomic-scale frustrated Josephson coupling and multicondensate visualization in FeSe.

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Researchers explored frustrated Josephson tunnelling in multiband superconductors using scanned Josephson tunnelling microscopy. They demonstrated tunable pathways and visualized anticorrelated superfluid modulations in FeSe, advancing multicondensate superconductivity research.

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Area of Science:

  • Condensed Matter Physics
  • Superconductivity

Background:

  • Multiband superconductors exhibit complex Josephson couplings, leading to frustrated superfluid densities.
  • Frustrated coupling involves quantum interference tunable via channel transparency.

Purpose of the Study:

  • To investigate frustrated Josephson tunnelling in the s±-wave superconductor FeSe.
  • To utilize atomic-resolution scanned Josephson tunnelling microscopy for condensate-resolved imaging and tuning.

Main Methods:

  • Employed atomic-resolution scanned Josephson tunnelling microscopy.
  • Analyzed tunnelling inequalities to quantitatively demonstrate frustrated Josephson tunnelling.
  • Tuned relative transparency of parallel tunnelling pathways.

Main Results:

  • Demonstrated tunable relative transparency of tunnelling pathways in FeSe.
  • Observed a tendency towards a 0-π transition with decreasing junction resistance.
  • Visualized anticorrelated superfluid modulations between condensates, indicating interband scattering.

Conclusions:

  • Scanned Josephson tunnelling microscopy provides unprecedented capabilities for studying multicondensate superconductivity.
  • The study quantitatively confirms frustrated Josephson tunnelling in FeSe.
  • Revealed insights into interband scattering effects in multiband superconductors.