Pairing Symmetry and Pairing State in Ferropnictides: Theoretical Overview

Abstract

We review the main ingredients for an unconventional pairing state in the ferropnictides, with particular emphasis on interband pairing due to magnetic fluctuations. Summarizing the key experimental prerequisites for such pairing, the electronic structure and nature of magnetic excitations, we discuss the properties of the s+/- state that emerges as a likely candidate pairing state for these materials and survey experimental evidence in favor of and against this novel state of matter.

This is a review contributed to the special issue of the Physica C on Fe-based superconductors. Revised version, many typos and mistakes corrected, figures and bibliography improved, discussion of the nematic transition expanded

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• Tightly-bound Cooper pair, quasiparticle kinks and clues on the pairing potential in a high Tc FeAs Superconductor
• Magnetic Order of the Iron Spins in NdOFeAs
• Lifting of nodes by disorder in extended-$s$ state superconductors: application to ferropnictides
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• The London penetration depth in single crystals of Ba(Fe_{1-x}Co_x)_2As_2 at various doping levels
• Magnetic penetration depth of single crystal SmFeAsO_{1-x}F_y: a fully gapped superconducting state
• 59-Co and 75-As NMR Investigation of Electron-Doped High Tc Superconductor BaFe(1.8)Co(0.2)As(2) (Tc = 22K)
• Observation of the Josephson effect in Pb/(Ba,K)Fe2As2 single crystal junctions
• Interplay between magnetic properties and Fermi surface nesting in iron pnictides
• Interband superconductivity: contrasts between BCS and Eliashberg theory
• Spin Fluctuation Dynamics and Multiband Superconductivity in Iron Pnictides
• Andreev spectra and subgap bound states in multiband superconductors
• Two superconducting gaps in LaFeAsO0.92F0.08 revealed by 75As nuclear quadrupole resonance
• Antiferromagnetic Correlation and the Pairing Mechanism of the Cuprates and Iron Pnictides : a View From the Functional Renormalization Group Studies
• Columnar magnetic structure coupled with orthorhombic distortion in the antiferromagnetic iron arsenide SrFe${}_2$As${}_2$
• On the electronic structure of electron doped LaOFeAs as seen by X-ray absorption spectroscopy
• Anisotropic London Penetration Depth and Superfluid Density in Single Crystals of Iron-based Pnictide Superconductors
• Possible phase-sensitive tests of pairing symmetry in pnictide superconductors
• Determining gap nodal structures in Fe-based superconductors: angle-dependence of the low temperature specific heat in an applied magnetic field
• On superconducting and magnetic properties of iron-oxypnictides
• Spin Dynamics in Iron-based Layered Superconductor (La_{0.87}Ca_{0.13})FePO Revealed by ^{31}P and ^{139}La NMR Studies
• Anisotropic pairing in the iron pnictides
• Optical and Raman spectroscopy studies on Fe-based superconductors
• The role of striction at magnetic and structural transitions in iron-pnictides
• Theory of Raman response in a superconductor with extended s-wave symmetry: Application to Fe-pnictides
• Novel properties in Josephson junctions involving the cos(kx)cos(ky)-pairing state in iron-pnictides
• Electronic polarons and bipolarons in Fe-based superconductors: a pairing mechanism
• Thermodynamic properties of Ba1-xMxFe2As2 (M = La and K)
• Anomalous electron-phonon interaction in doped LaOFeAs: a First Principles calculation
• Limits on the Superconducting Order Parameter in NdFeAsO${}_{1-x}$F${}_y$ from Scanning SQUID Microscopy
• Charge dynamics of the spin-density-wave state in BaFe${}_2$As${}_2$
• Doping evolution of itinerant magnetic excitations in Fe-based oxypnictides
• Character of magnetic instabilities in CaFe2As2
• Experimental determination of the microscopic origin of magnetism in parent iron pnictides
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• NMR Studies on the Superconducting Symmetry of Iron Pnictide Systems

Cited by in corpus (242)

• The Puzzle of High Temperature Superconductivity in Layered Iron Pnictides and Chalcogenides
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• Effects of nematic fluctuations on the elastic properties of iron arsenide superconductors
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• Magnetism in Fe-based superconductors
• Uniaxial strain detwinning of CaFe2As2 and BaFe2As2: optical and transport study
• Probing multiband superconductivity by point-contact spectroscopy
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• Quantum criticality and nodal superconductivity in the FeAs-based superconductor KFe2As2
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• Spin Gap and Resonance at the Nesting Wavevector in Superconducting FeSe0.4Te0.6
• Unconventional pairing in the iron arsenide superconductors
• Nematicity, magnetism and superconductivity in FeSe
• Unconventional superconductivity and antiferromagnetic quantum critical behavior in the isovalent-doped BaFe2(As1-xPx)2
• Spectroscopic scanning tunneling microscopy insights into Fe-based superconductors
• Weak-link behavior of grain boundaries in superconducting Ba(Fe1-xCox)2As2 bicrystals
• Nematic susceptibility of hole- and electron-doped BaFe2As2 iron-based superconductors from shear modulus measurements
• s+is State with Broken Time Reversal Symmetry in Fe-Based Superconductors
• Microscopic origin of magnetism and magnetic interactions in ferropnictides
• Space group symmetry, spin-orbit coupling and the low energy effective Hamiltonian for iron based superconductors
• Fe-based superconductors: an angle-resolved photoemission spectroscopy perspective
• Nodes in the gap structure of the iron-arsenide superconductor Ba(Fe_{1-x}Co_x)_2As_2 from c-axis heat transport measurements
• Superconductivity and spin-density-waves in multi-band metals
• Consistent model of magnetism in ferropnictides
• Integer and half-integer flux-quantum transitions in a niobium/iron-pnictide loop
• Superfluid density and specific heat within self-consistent scheme for two-band superconductor
• Isotropic superconducting gaps with enhanced pairing on electron Fermi surfaces in FeTe0.55Se0.45
• The behavior of grain boundaries in the Fe-based superconductors
• Fe-based superconductors: seven years later
• Universal Decomposition of the Low-Frequency Conductivity Spectra of Iron-Pnictides Uncovering Fermi-Liquid Behavior
• Anisotropic superconducting properties of single-crystalline FeSe0.5Te0.5
• Dichotomy between large local and small ordered magnetic moment in Iron-based superconductors
• Frustrated Magnetic Interactions, Giant Magneto-Elastic Coupling, and Magnetic Phonons in Iron-Pnictides
• Effects of magnetism and doping on the electron-phonon coupling in BaFe${}_2$As${}_2$
• To use or not to use cool superconductors?
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• Hole and Electron Contributions to the Transport Properties of Ba(Fe_(1-x)Ru_x)_2As_2 Single Crystals
• Spin fluctuations in LiFeAs observed by neutron scattering
• Interplay of magnetic and structural transitions in Fe-based pnictide superconductors
• Directional point-contact Andreev-reflection spectroscopy of Fe-based superconductors: Fermi surface topology, gap symmetry, and electron-boson interaction
• Spin waves in the $(\pi ,0)$ magnetically ordered iron chalcogenide Fe${}_{1.05}$Te
• Renormalization group flow, competing phases, and the structure of superconducting gap in multi-band models of Iron based superconductors
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• Is the term "type-1.5 superconductivity" warranted by Ginzburg-Landau theory?
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• Enhancement of the superconducting gap by nesting in CaKFe4As4 - a new high temperature superconductor
• Pair-breaking in iron-pnictides
• Doping dependence of the lattice dynamics in Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ studied by Raman spectroscopy
• Possible pairing symmetries in SrPtAs with a local lack of inversion center
• Multigap superconductivity and strong electron-boson coupling in Fe-based superconductors: A point-contact Andreev-reflection study of Ba(Fe1-xCox)2As2 single crystals
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• Magnetic interactions in iron superconductors: A review
• Crystallographic, Electronic, Thermal and Magnetic Properties of Single-Crystal SrCo2As2
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• Electron-doping evolution of the low-energy spin excitations in the iron arsenide BaFe${}_{2-x}$Ni${}_x$As${}_2$ superconductors
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• Superconductivity at 23 K in Pt doped BaFe2As2 single crystals
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• Is Fermi-surface nesting the origin of superconductivity in iron pnictides?: A fluctuation-exchange-approximation study
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• Effect of doping and pressure on magnetism and lattice structure of Fe-based superconductors
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• Local moments and symmetry breaking in metallic PrMnSbO
• Upper critical field and thermally activated flux flow in single crystalline Tl${}_{0.58}$Rb${}_{0.42}$Fe${}_{1.72}$Se${}_2$
• Itinerant Nature of Magnetism in Iron Pnictides: A first principles study
• Resonance as a probe of the electron superconducting gap in BaFe1.9Ni0.1As2
• ARPES measurements of the superconducting gap of Fe-based superconductors and their implications to the pairing mechanism
• Entangled Orbital Triplet Pairs in Iron-Based Superconductors
• An ARPES view on the high-Tc problem: phonons vs spin-fluctuations
• Heat capacity jump at Tc and pressure derivatives of superconducting transition temperature in the Ba1-xKxFe2As2 (0.2 < x < 1.0) series
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• Progressive slowing down of spin fluctuations in underdoped LaFeAsO${}_{1-x}$F${}_x$
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• The suppression of magnetism and the development of superconductivity within the collapsed tetragonal phase of Ca0.67Sr0.33Fe2As2 at high pressure
• Magnetic excitations in underdoped Ba(Fe1-xCox)2As2 with x=0.047
• Quasiparticle Interference in the Unconventional Metamagnetic Compound Sr${}_3$Ru${}_2$O${}_7$
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• Spin resonance in the superconducting state of Li${}_{1-x}$Fe${}_x$ODFe${}_{1-y}$Se observed by neutron spectroscopy
• Superconductivity and electronic fluctuations in Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$ studied by Raman scattering
• Eliashberg theory for spin-fluctuations mediated superconductivity -- Application to bulk and monolayer FeSe
• Vortex state in iron-based superconductors with collinear antiferromagnetic cores
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• On the dual role of the d-electrons in iron-pnictides
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• Quasi-Two-Dimensional Fermi Surfaces and Coherent Interlayer Transport in KFe${}_2$As${}_2$
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• Superconductivity in titanium-based pnictide oxide compounds
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• Is BaCr${}_2$As${}_2$ symmetrical to BaFe${}_2$As${}_2$ with respect to half $3d$ shell filling?
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• Whether it is possible to stabilize the 1144-phase pnictides with tri-valence cations?
• Probing the Order Parameter of Superconducting LiFeAs using Pb/LiFeAs and Au/LiFeAs Point-Contact Spectroscopy
• Direct observation of the influence of the FeAs4 tetrahedron on superconductivity and antiferromagnetic correlations in Sr2VO3FeAs
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• Temperature dependence of the resonance and low energy spin excitations in superconducting FeTe${}_{0.6}$Se${}_{0.4}$
• Estimation of intraband and interband relative coupling constants from temperature dependences of the order parameter for two-gap superconductors
• Superconducting properties of (Ba-K)Fe2As2 single crystals disordered with fast neutron irradiation
• Interorbital pair scattering in clean and impure superconductors
• Effect of annealing on the specific heat of optimally doped Ba(Fe${}_{0.92}$Co${}_{0.08}$)${}_2$As${}_2$
• Magnetic neutron scattering studies on the Fe-based superconductor system Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$
• ARPES observation of isotropic superconducting gaps in isovalent Ru-substituted Ba(Fe${}_{0.75}$Ru${}_{0.25}$)${}_2$As${}_2$
• Low-Energy Quasiparticles Probed by Heat Transport in the Iron Based Superconductor LaFePO
• Phase-sensitive determination of nodal $\mathbf{d}$-wave order parameter in single-band and multiband superconductors
• Thermoelectric power of Ba(Fe1-xCox)2As2, 0\leqx\leq0.05, and Ba(Fe1-xRhx)2As2, (0\leqx\leq0.171)
• Unitarity in periodic potentials: a renormalization group analysis
• Uniform chemical pressure effect in solid solutions Ba(1-x)Sr(x)Fe2As2 and Sr(1-x)Ca(x)Fe2As2
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• Two-Gap Superconductivity in CaFe_{0.88}Co_{0.12}AsF Revealed by Temperature Dependence of the Lower Critical Field H_{c1}^c(T)
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• The effect of spin fluctuations on the electronic structure in iron based superconductors
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• Effect of pairing fluctuations on the spin resonance in Fe-based superconductors
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• Superconductivity In K- And Na- Doped Bafe2as2: What Can We Learn From Heat Capacity And Pressure Dependence of Tc
• How chemical pressure affects the fundamental properties of rare-earth pnictides: an ARPES view
• Charge correlations suppress unconventional pairing in the Holstein model
• THz optical response of Ba(Fe${}_{1-x}$Ni${}_x$)${}_2$As${}_2$ films analyzed within the three-band Eliashberg s${}_{\pm }$-wave model
• Optical Properties of Bogoliubov Quasiparticles
• Magnetization distribution and orbital moment in the non-Superconducting Chalcogenide Compound K0.8Fe1.6Se2
• Multiple gaps revealed by low temperature specific heat in the 1111-type CaFe_{0.88}Co_{0.12}AsF single crystals
• The interactions between antiferromagnetism, tetrahedral sites and electron-phonon coupling in FeSe1-xTex and FeSe/SrTiO3
• Interrupted orbital motion in density-wave systems
• Magnetism and Superconductivity in Iron-based Superconductors Decided by Condensed Particle-hole Excitations away from the Fermi Level