Raman scattering as a probe of nematic correlations

Abstract

We use the symmetry constrained low energy effective Hamiltonian of iron based superconductors to study the Raman scattering in the normal state of underdoped iron-based superconductors. The incoming and scattered Raman photons couple directly to orbital fluctuations and indirectly to the spin fluctuations. We computed both couplings within the same low energy model. The symmetry constrained Hamiltonian yields the coupling between the orbital and spin fluctuations of only the same symmetry type. Attraction in B2g symmetry channel was assumed for the system to develop the subleading instability towards the discrete in-plane rotational symmetry breaking, referred to as Ising nematic transition. We find that upon approaching this instability, the Raman spectral function develops a quasi-elastic peak as a function of energy transferred by photons to the crystal. We attribute this low-energy B2g scattering to the critical slow-down associated with the build up of nematic correlations.

arXiv comment9 pages, 3 figures

References in corpus (34)

• Superconductivity at 43 K in Samarium-arsenide Oxides $SmFeAs{O}_{1-x}{F}_x$
• The Puzzle of High Temperature Superconductivity in Layered Iron Pnictides and Chalcogenides
• Unconventional pairing originating from disconnected Fermi surfaces in superconducting LaFeAsO${}_{1-x}$F${}_x$}
• Superconductivity in Iron Compounds
• High-temperature superconductivity in iron-based materials
• Nematic order in iron superconductors - who is in the driver's seat?
• Superconductivity at 22 K in Co-doped BaFe2As2 Crystals
• Evidence for an electron nematic phase transition in underdoped iron pnictide superconductors
• Magnetism, superconductivity, and pairing symmetry in Fe-based superconductors
• Inelastic Light Scattering From Correlated Electrons
• Divergent nematic susceptibility in an iron arsenide superconductor
• Determination of the phase diagram of the electron doped superconductor Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Ising and Spin orders in Iron-based Superconductors
• Ferro-Orbital Order and Strong Magnetic Anisotropy in the Parent Compounds of Iron-Pnictide Superconductors
• Preemptive nematic order, pseudogap, and orbital order in the iron pnictides
• Spin-orbital frustrations and anomalous metallic state in iron-pnictide superconductors
• Effects of nematic fluctuations on the elastic properties of iron arsenide superconductors
• Multiband magnetism and superconductivity in Fe-based compounds
• Orbital-Ordering Induces Structural Phase Transition and the Resistivity Anomaly in Iron Pnictides
• Contrasting Spin Dynamics Between Underdoped and Overdoped Ba(Fe[1-x]Co[x])2As2
• Self-Consistent Vertex Correction Analysis for Iron-Based Superconductors: Mechanism of Coulomb-Interaction-Driven Orbital Fluctuations
• Unconventional superconductivity and antiferromagnetic quantum critical behavior in the isovalent-doped BaFe2(As1-xPx)2
• Observation of incipient charge nematicity in Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Space group symmetry, spin-orbit coupling and the low energy effective Hamiltonian for iron based superconductors
• Renormalization group analysis of competing orders and the pairing symmetry in Fe-based superconductors
• Scaling between magnetic and lattice fluctuations in iron-pnictide superconductors
• Spin gap and magnetic resonance in superconducting BaFe${}_{1.9}$NiAs${}_2$
• Superconductivity in single crystals of LaFePO
• Charge-fluctuation contribution to the Raman response in superconducting cuprates
• Competition between stripe and checkerboard magnetic instabilities in Mn-doped BaFe2As2
• Linear Response Theory for Shear Modulus $C_{66}$ and Raman Quadrupole Susceptibility: Significant Evidence for Orbital Nematic Fluctuations in Fe-Based Superconductors
• Orbital fluctuation theory in iron-based superconductors: s-wave superconductivity, structure transition, and impurity-induced nematic order
• Electronic Raman scattering from orbital nematic fluctuations
• Nesting Induced Large Magnetoelasticity in the Iron Arsenide Systems

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• Sign-reversing orbital polarization in the nematic phase of FeSe due to the $C_2$ symmetry-breaking in the self-energy
• Critical Quadrupole Fluctuations and Collective Modes in Iron Pnictide Superconductors
• Nematic fluctuations and the magneto-structural phase transition in $\mathrm{Ba}(\mathrm{F}{\mathrm{e}}_{1-\mathrm{x}}\mathrm{C}{\mathrm{o}}_{\mathrm{x}}{)}_2\mathrm{A}{\mathrm{s}}_2$
• Elastic coupling and spin-driven nematicity in iron-based superconductors
• Spin-Driven Nematic Instability of the Multi-Orbital Hubbard Model: Application to Iron-Based Superconductors
• Manifestation of nematic degrees of freedom in the Raman response function of iron pnictides
• Orbital mismatch boosting nematic instability in iron-based superconductors
• 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
• Nematic Fluctuations and Phase Transitions in LaFeAsO: a Raman Scattering Study
• Raman resonance in iron-based superconductors: The magnetic scenario
• Dynamical susceptibility of a near-critical non-conserved order parameter and B2g Raman response in Fe-based superconductors
• Fluctuations and pairing in Fe-based superconductors: Light scattering experiments
• Superconductivity and fluctuation in Ba${}_{1-p}$K${}_p$Fe${}_2$As${}_2$ and Ba(Fe${}_{1-n}$Co${}_n$)${}_2$As${}_2$
• Theories for charge-driven nematicity in kagome metals