Raman scattering near a d-wave Pomeranchuk instability

Abstract

Motivated by recent transport and neutron scattering experiments suggesting an orientational symmetry breaking in underdoped cuprates we present a theoretical study of Raman scattering near a d-wave Pomeranchuk instability (PI). The d-wave component of Raman scattering from electrons and phonons allows to study directly order parameter fluctuations associated with the PI. Approaching the PI from the normal state by lowering the temperature a central peak emerges both in electronic and, as an additional low-frequency feature, in phononic scattering. Approaching the PI in the superconducting state at low temperature by decreasing the doping concentration the central peak is replaced by a soft mode with strongly decreasing width and energy and increasing spectral weight. These predicted low-energy features in Raman scattering could confirm in a rather direct way the presence of a PI in high-temperature cuprate superconductors and in Sr3Ru2O7.

26 pages, 9 figures

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Cited by in corpus (13)

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• Charge Nematicity and Electronic Raman Scattering in Iron-based Superconductors
• Critical Quadrupole Fluctuations and Collective Modes in Iron Pnictide Superconductors
• Superconductivity from orbital nematic fluctuations
• Dynamical susceptibility near a long-wavelength critical point with a nonconserved order parameter
• Electronic Raman scattering from orbital nematic fluctuations
• High Tc superconductivity in CaKFe${}_4$As${}_4$ in absence of nematic fluctuations
• Lattice-Shifted Nematic Quantum Critical Point in FeSe${}_{1-x}$S${}_x$
• Elastoresistance measurements on CaKFe${}_4$As${}_4$ and KCa${}_2$Fe${}_4$As${}_4$F${}_2$ with the Fe site of $C_{2v}$ symmetry
• Superconducting pairing and the pseudogap in nematic striped La2-xSrxCuO4
• Fluctuations and pairing in Fe-based superconductors: Light scattering experiments
• Theoretical insights into electronic nematic order, bond-charge orders, and plasmons in cuprate superconductors
• Spontaneous fourfold-symmetry breaking driven by electron-lattice coupling and strong correlations in high-$T_c$ cuprates