Nematic orders in Iron-based superconductors

Abstract

In the newly discovered iron-based superconductors, many experiments have demonstrated the existence of the rotational symmetry breaking nematic order, which has been a prevailing phenomenon in many correlated electronic systems. In this paper, we review nematic behaviors in iron-pnictides and the mechanism behind the development of the nematic order. We discuss evidences that support the spin-driven nematicity in iron-pnictides. Theories, results and predictions will be discussed based on this picture. We also briefly discuss the generalization of this theory to the nematicity in iron-chalcogenides.

Invited review article for special issue "Stripes and Electronic Liquid Crystals in Strongly Correlated Systems" of Physica C; Review article for Special Issue of Physica C: "Stripes and Electronic Liquid Crystals in Strongly Correlated Systems", 2011

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• Theory of Intertwined Orders in High Temperature Superconductors
• Iron based high transition temperature superconductors
• Intertwined vestigial order in quantum materials: nematicity and beyond
• Optical response of correlated electron systems
• Spin excitation anisotropy as a probe of orbital ordering in the paramagnetic tetragonal phase of superconducting BaFe1.904Ni0.096As2
• Enhancing magnetic stripe order in iron pnictides by RKKY exchange interactions
• In-plane spin excitation anisotropy in the paramagnetic phase of NaFeAs
• Uniaxial pressure effect on structural and magnetic phase transitions in NaFeAs and its comparison with as-grown and annealed BaFe${}_2$As${}_2$
• Electronic nematic correlations in the stress free tetragonal state of BaFe${}_{2-x}$Ni${}_x$As${}_2$
• Origin of electronic dimers in the spin-density wave phase of Fe-based superconductors
• Spin excitations in the nematic phase and the metallic stripe spin-density wave phase of iron pnictides
• Robust short-range-ordered nematicity in FeSe evidenced by high-pressure NMR
• Effects of Lifshitz Transition on Charge Transport in Magnetic Phases of Fe-Based Superconductors
• The evolution of antiferromagnetic susceptibility to uniaxial pressure in Ba(Fe{1-x}Co{x})2As2
• Nematicity and superconductivity: Competition versus cooperation
• Double magnetic resonance and spin anisotropy in Fe-based superconductors due to static and fluctuating antiferromagnetic orders
• Enhanced superconducting transition temperature in hyper-interlayer-expanded FeSe despite the suppressed electronic nematic order and spin fluctuations
• Driving force of the orbital-relevant electronic nematicity in Fe-based superconductors
• Observation of orbital ordering and origin of the nematic order in FeSe
• Nematic fluctuations in the non-superconducting iron pnictide BaFe${}_{1.9-x}$Ni${}_{0.1}$Cr${}_x$As${}_2$
• Spontaneous Fermi surface deformation in the three-band Hubbard model: A variational Monte Carlo study
• Influence of orbital nematic order on spin responses in Fe-based superconductors
• Unusual band splitting and superconducting gap evolution with sulfur substitution in FeSe
• Phase transition in CaFeAsH: bridging 1111 and 122 iron-based superconductors