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D F Agterberg1, T Shishidou1, J O'Halloran1

  • 1Department of Physics, University of Wisconsin, Milwaukee, Wisconsin 53201, USA.

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PubMed
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Monolayer iron selenide (FeSe) superconductivity is explained by magnetic order fluctuations. This theory predicts a nodeless d-wave state, differing from initial s-wave interpretations.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Materials

Background:

  • Monolayer iron selenide (FeSe) shows high superconducting transition temperatures.
  • Experimental data suggests a fully gapped superconducting state, initially interpreted as s-wave.

Purpose of the Study:

  • To develop a theoretical model for superconductivity in monolayer FeSe.
  • To explain the observed electronic states and reconcile experimental findings with theoretical predictions.

Main Methods:

  • A symmetry-based k·p-like theory was developed to describe electronic states.
  • The theory incorporates coupling to fluctuations of checkerboard magnetic order.
  • Spin-orbit coupling effects were analyzed in relation to the superconducting gap.

Main Results:

  • The theory predicts a fully gapped, nodeless d-wave superconducting state.
  • This d-wave state remains nodeless due to a smaller energy scale of spin-orbit coupling compared to the superconducting gap.
  • The model naturally accounts for experimentally observed electronic states via angle-resolved photoemission spectroscopy.

Conclusions:

  • The study provides a theoretical framework explaining superconductivity in monolayer FeSe.
  • The findings suggest that the superconducting state is a nodeless d-wave, challenging previous s-wave interpretations.
  • The interplay between magnetic fluctuations, spin-orbit coupling, and superconductivity is crucial for understanding this material.