Quadrupolar charge dynamics in the nonmagnetic FeSe${}_{1-x}$S${}_x$ superconductors

Abstract

We use polarization-resolved electronic Raman spectroscopy to study charge dynamics in non-magnetic FeSe${}_{1-x}$S${}_x$ superconductor. We observe two features of the $XY$ quadrupole symmetry: a low-energy quasi-elastic peak (QEP) and an electronic continuum. The QEP exhibits critical enhancement upon cooling towards the structural transition at $T_S(x)$. Below $T_S(x)$, the QEP diminishes gradually, and a gap with temperature evolution reminiscent of a mean-field order parameter opens in the continuum. The intensity of the QEP develops with increasing sulfur doping $x$ and maximizes at $x\approx$ 0.15, while the gap magnitude decreases with the suppression of $T_S(x)$. We interpret the development of the gap in the quadrupole scattering channel as the formation of a stripe quadrupole order: a wave of quadrupole moment without charge or spin modulation.

arXiv commentThis is a preprint of an article published in the Proceedings of the National Academy of Sciences (PNAS). The final authenticated version is available online at: https://doi.org/10.1073/pnas.2020585118

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• Low frequency Raman response near Ising-nematic quantum critical point: a memory matrix approach
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• Multipolar nematic state of nonmagnetic FeSe based on the DFT+$U$
• Evolution of lattice, spin, and charge properties across the phase diagram of FeSe${}_{1-x}$S${}_x$
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