Nematicity driven by hybridization in iron-based superconductors

Abstract

In this paper we study an effective model for the normal state of iron-based superconductors. It has separate, but interacting itinerant and localized degrees of freedom, originating from the d_xz and d_yz, and from d_xy iron orbitals respectively. At low temperatures, below a mean-field phase transition, these different states condense together in an excitonic order parameter. We show that at even lower temperature, after another phase transition, this ordered state can spontaneously break the C_4 lattice symmetry and become nematic. We propose this mechanism as an explanation of the tendency towards nematicity observed in several iron-based compounds.

5 pages, 3 figures, new references added, replaced Fig. 1, fixed several typos

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• Observation of two distinct $d_{xz}/d_{yz}$ band splittings in FeSe
• Magnetism, superconductivity, and spontaneous orbital order in iron-based superconductors: who comes first and why?
• Scaling between magnetic and lattice fluctuations in iron-pnictide superconductors
• Critical Quadrupole Fluctuations and Collective Modes in Iron Pnictide Superconductors
• Distinguishing spin-orbit coupling and nematic order in the electronic spectrum of iron-based superconductors
• Interplay between magnetism, superconductivity, and orbital order in a 5-pocket model for iron-based superconductors - a parquet renormalization group study
• Ferro-orbital ordering transition in iron telluride Fe${}_{1+y}$Te
• Emergence of Orbital Nematicity in the Tetragonal Phase of BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$
• Competing instabilities, orbital ordering and splitting of band degeneracies from a parquet renormalization group analysis of a 4-pocket model for iron-based superconductors: application to FeSe
• Resistive anisotropy due to spin-fluctuation scattering in the nematic phase of iron pnictides
• Strong Coupling of the Iron-Quadrupole and Anion-Dipole Polarizations in Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Mott-Kondo Insulator Behavior in the Iron Oxychalcogenides
• Nematicity from mixed S_{+-} + d_{x^2-y^2} states in iron-based superconductors
• Mechanism for nematic superconductivity in FeSe
• Electronic structure properties in the nematic phases of FeSe
• Origin of doping-induced suppression and reemergence of magnetism in LaFeAsO${}_{1-x}$H${}_x$
• Symmetry-mixed bound-state order: extended degeneracy of $(d+ig)$-superconductivity in ${\mathrm{Sr}}_2\mathrm{Ru}{\mathrm{O}}_4$
• Nematicity and magnetism in LaFeAsO single crystals probed by ${}^{75}$As nuclear magnetic resonance
• Study of antiferromagnetic and nematic phase transitions in $BaF{e}_2(A{s}_{1-x}{P}_x{)}_2$ by AC micro-calorimetry and SQUID magnetometry
• Unexpected Enhancement of Three-Dimensional Low-Energy Spin Correlations in Quasi-Two-Dimensional Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$ System at High Temperature
• Theories for charge-driven nematicity in kagome metals
• Strain tuning and anisotropic spin correlations in iron-based systems