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Superconducting gap structure in the electron doped BiS2-based superconductor.

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Electron doping in semimetallic SrFBiS2 was studied using muon spin relaxation. La doping induces superconductivity, characterized by an isotropic s-wave gap, with no broken time-reversal symmetry observed.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity

Background:

  • SrFBiS2 is a semimetallic material with potential for superconductivity.
  • La doping induces bulk superconductivity at 2.8 K at ambient pressure.

Purpose of the Study:

  • Investigate the influence of electron doping on the superconducting properties of SrFBiS2.
  • Characterize the superconducting gap and electronic properties.

Main Methods:

  • Resistivity measurements.
  • Zero and transverse-field (ZF/TF) muon spin relaxation/rotation (μSR) experiments.

Main Results:

  • Superfluid density data best fit an isotropic s-wave superconducting gap model.
  • Estimated magnetic penetration depth (λ) and superconducting carrier density (n_s).
  • Effective-mass enhancement (m*) was found to be 1.558 m_e.
  • No spontaneous internal magnetic fields observed below the superconducting transition, indicating no broken time-reversal symmetry.

Conclusions:

  • The superconducting state in electron-doped SrFBiS2 is consistent with an isotropic s-wave gap.
  • The absence of broken time-reversal symmetry aligns with theoretical predictions.