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Researchers observed nonreciprocal charge transport in iron selenium (FeSe) superconducting films. This indicates surface symmetry breaking, driven by thermally excited vortices in the film's two-dimensional structure.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity

Background:

  • Iron selenium (FeSe) is a centrosymmetric superconductor.
  • Nonreciprocal charge transport signifies broken inversion symmetry.
  • Vortex flow in superconductors is typically associated with specific field configurations.

Purpose of the Study:

  • To investigate nonreciprocal charge transport in FeSe superconducting films.
  • To explore the role of symmetry breaking in the vortex flow regime.
  • To understand the origin of nonreciprocal transverse signals under in-plane magnetic fields.

Main Methods:

  • Fabrication and characterization of FeSe superconducting films.
  • Electrical transport measurements under applied in-plane magnetic fields.
  • Analysis of longitudinal and transverse charge transport signals.

Main Results:

  • Observed clear nonreciprocal charge transport signals in both longitudinal and transverse directions.
  • Demonstrated surface symmetry breaking in centrosymmetric FeSe films.
  • Detected nonreciprocal transverse signals in a configuration where vortex motion is unexpected.

Conclusions:

  • The observed nonreciprocal signals are attributed to symmetry breaking at the film surfaces.
  • Thermally excited vortices in the 2D FeSe system are proposed as the mechanism for nonreciprocal transverse response.
  • This finding offers new insights into the physics of nonreciprocal transport in superconductors.