Tuning quantum paramagnetism and d-wave superconductivity in single-layer iron chalcogenides by chemical pressure

Qiang Zou; Basu Dev Oli; Huimin Zhang; Tatsuya Shishidou; Daniel Agterberg; Michael Weinert; Lian Li

Tuning quantum paramagnetism and d-wave superconductivity in single-layer iron chalcogenides by chemical pressure

Superconductivity 2023-10-10 v2

Authors: Qiang Zou , Basu Dev Oli , Huimin Zhang , Tatsuya Shishidou , Daniel Agterberg , Michael Weinert , Lian Li

Abstract

By substituting S into single-layer FeSe/SrTiO3, chemical pressure is applied to tune its paramagnetic state that is modeled as an incoherent superposition of spin-spiral states. The resulting electronic bands resemble an ordered checkerboard antiferromagnetic structure, consistent with angle-resolved photoemission spectroscopy measurements. Scanning tunneling spectroscopy reveals a gap evolving from U-shaped for FeSe to V-shaped for FeS with decreasing size, attributed to a d-wave superconducting state for which nodes emerge once the gap size is smaller than the effective spin-orbit coupling.

Keywords

single-layer iron chalcogenides chemical pressure quantum paramagnetism d-wave superconductivity spin-spiral states scanning tunneling spectroscopy

Cite

@article{arxiv.2212.13603,
  title  = {Tuning quantum paramagnetism and d-wave superconductivity in single-layer iron chalcogenides by chemical pressure},
  author = {Qiang Zou and Basu Dev Oli and Huimin Zhang and Tatsuya Shishidou and Daniel Agterberg and Michael Weinert and Lian Li},
  journal= {arXiv preprint arXiv:2212.13603},
  year   = {2023}
}

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Tuning quantum paramagnetism and d-wave superconductivity in single-layer iron chalcogenides by chemical pressure

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