Quadrupolar charge dynamics in the nonmagnetic FeSe1−xSx superconductors

@article{Zhang2021QuadrupolarCD,
  title={Quadrupolar charge dynamics in the nonmagnetic FeSe1−xSx superconductors},
  author={Weilu Zhang and Shangfei Wu and Shigeru Kasahara and Takasada Shibauchi and Yuji Matsuda and Girsh Blumberg},
  journal={Proceedings of the National Academy of Sciences},
  year={2021},
  volume={118}
}
Significance The family of iron selenide (FeSe) superconductors is of great interest because it harbors an unusual nonmagnetic nematic state, exhibits a peculiar orbital-selective Cooper pairing, and has a strong potential for high-temperature superconductivity. Here, for FeSe1−xSx nonmagnetic metal, we report discovery of a pseudogap in the spectra of electronic long-wavelength charge quadrupole excitation below the nematic phase transition with temperature dependence of the gap’s magnitude… 
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