In the nematic state of FeSe, B1g Raman intensity is suppressed at low frequencies because the orbital content of the Fermi pockets becomes nearly mono-orbital, and charge-conservation vertex corrections cancel the resulting s-wave component of the Raman vertex.
Quadrupolar charge dynamics in the nonmagnetic FeSe$_{1-x}$S$_x$ superconductors
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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.
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Raman response in the nematic phase of FeSe
In the nematic state of FeSe, B1g Raman intensity is suppressed at low frequencies because the orbital content of the Fermi pockets becomes nearly mono-orbital, and charge-conservation vertex corrections cancel the resulting s-wave component of the Raman vertex.