Magnetism, superconductivity, and pairing symmetry in Fe-based superconductors

Abstract

We analyze antiferromagnetism and superconductivity in novel $Fe-$based superconductors within the itinerant model of small electron and hole pockets near $(0,0)$ and $(\pi ,\pi )$. We argue that the effective interactions in both channels logarithmically flow towards the same values at low energies, {\it i.e.}, antiferromagnetism and superconductivity must be treated on equal footings. The magnetic instability comes first for equal sizes of the two pockets, but looses to superconductivity upon doping. The superconducting gap has no nodes, but changes sign between the two Fermi surfaces (extended s-wave symmetry). We argue that the $T$ dependencies of the spin susceptibility and NMR relaxation rate for such state are exponential only at very low $T$, and can be well fitted by power-laws over a wide $T$ range below $T_c$.

12 pages, 9 figures. References added, the formula for the susceptibility corrected

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• Magnetic Order versus superconductivity in the Iron-based layered La(O1-xFx)FeAs systems
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• Is LaO${}_{1-x}$F${}_x$FeAs an electron-phonon superconductor ?
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• The BCS-like gap in superconductor SmFeAsO_0.85F_0.15
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• Neutron scattering as a probe of the Fe-pnicitide superconducting gap
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• Anomalous proximity effects at the interface of s and s+- superconductors
• Properties of a diagonal 2-orbital ladder model of the Fe-pnictide superconductors
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• Study of phase diagram and superconducting states in LaFeAsO${}_{1-x}$H${}_x$ based on the multiorbital extended Hubbard model
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• Accurate bare susceptibilities from full-potential $\text{ab initio}$ calculations
• Nematicity from mixed S_{+-} + d_{x^2-y^2} states in iron-based superconductors
• LDA+DMFT approach to ordering phenomena and the structural stability of correlated materials
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• Excitonic and Nematic Instabilities on the Surface of Topological Kondo Insulators
• Microwave response of superconducting pnictides: extended $s_{\pm }$ scenario
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• Determination of Superconducting Gap of SmFeAsFxO1-x Superconductors by Andreev Reflection Spectroscopy
• Effect of realistic finite-size impurities on Tc in Fe-based superconductors based on the five-orbital tight-binding model
• Lifshitz transitions and crystallization of fully-polarised dipolar Fermions in an anisotropic 2D lattice
• Raman scattering as a probe of nematic correlations
• Pair breaking due to orbital magnetism in iron-based superconductors
• Time-reversal symmetry breaking state near the surface of $s_{\pm }$-superconductor
• Single Impurity Effects in Multiband Superconductors with Different Sign Order Parameters
• Magnetic resonance from the interplay of frustration and superconductivity
• Transition from sign-reversed to sign-preserved Cooper-pairing symmetry in sulfur-doped iron selenide superconductors
• Thermal Hall Conductivity as a Probe of Gap Structure in Multi-band Superconductors: The Case of $\mathrm{B}{\mathrm{a}}_{1-\mathrm{x}}{\mathrm{K}}_{\mathrm{x}}\mathrm{F}{\mathrm{e}}_2\mathrm{A}{\mathrm{s}}_2$
• Charge density wave instabilities of type-II Weyl semimetals in a strong magnetic field
• Visualizing the out-of-plane electronic dispersions in an intercalated transition metal dichalcogenide
• Lifshitz transitions in a heavy-Fermion liquid driven by short-range antiferromagnetic correlations in the two-dimensional Kondo lattice model
• The electronic instabilities of the Iron-based superconductors: a variational Monte-Carlo study
• Pairing symmetry and topological surface state in iron-chalcogenide superconductors
• Understanding repulsively mediated superconductivity of correlated electrons via massively parallel DMRG
• Correlation, doping and interband effects on the optical conductivity of iron superconductors
• Penetration depth, lower critical fields, and quasiparticle conductivity in Fe-arsenide superconductors
• Non-London electrodynamics in a multiband London model: anisotropy-induced non-localities and multiple magnetic field penetration lengths
• Calorimetric Evidence for Nodes in the Overdoped Ba(Fe${}_{0.9}$Co${}_{0.1}$)${}_2$As${}_2$
• Angular resolved specific heat in iron-based superconductors: the case for nodeless extended $s$-wave gap
• A weak-coupling superconductivity in the electron doped NaFe${}_{0.95}$Co${}_{0.05}$As is revealed by ARPES
• Electric and magnetic multipoles and bond orders in excitonic insulators
• Superconducting pairing in the spin-density-wave phase of iron pnictides
• Magnetic penetration-depth measurements of a suppressed superfluid density of superconducting Ca${}_{0.5}$Na${}_{0.5}$Fe${}_2$As${}_2$ single crystals by proton irradiation
• Specific heat jump at superconducting transition in the presence of Spin-Density-Wave in iron-pnictides
• Effect of nodes, ellipticity and impurities on the spin resonance in Iron-based superconductors
• Mutual independence of critical temperature and superfluid density under pressure in optimally electron-doped superconducting LaFeAsO${}_{1-x}$F${}_x$
• Antiferromagnetic Spin Fluctuations and Unconventional Nodeless Superconductivity in an Iron-based New Superconductor (Ca_4Al_2O_{6-y})(Fe_2As_2):75As-NQR Study
• Multiband Effects on Superconducting Instabilities Driven by Electron-Electron Interactions
• Phase diagram of dirty two-band superconductors and observability of impurity-induced $s+is$ state
• Multiorbital effects in the functional renormalization group: A weak-coupling study of the Emery model
• Effect of gap anisotropy on the spin resonance peak in the superconducting state of iron-based materials
• Electrodynamic response of Ba(Fe1-xRhx)2As2 across the s+- to s++ order parameter transition
• Transport anomalies due to anisotropic interband scattering
• A Twisted Ladder: relating the Fe superconductors to the high $T_c$ cuprates
• Paramagnon dispersion in $\beta$-FeSe observed by Fe $L$-edge resonant inelastic x-ray scattering
• Isotope effect and the role of phonon in the Fe-based superconductors
• Transport properties of 3D extended s-wave states in Fe-based superconductors
• Evidence for a full energy gap for nickel-pnictide LaNiAsO_{1-x}F_x superconductors by ^{75}As nuclear quadrupole resonance
• Nanoscale textured superconductivity in Ru-substituted BaFe2As2 : a challenge to a universal phase diagram for the pnictides
• Commensurate antiferromagnetic ordering in Ba(Fe{1-x}Co{x})2As2 determined by x-ray resonant magnetic scattering at the Fe K-edge
• ${}^{75}$As NMR of Ba(Fe${}_{0.93}$Co${}_{0.07}$)${}_2$As${}_2$ in High Magnetic Field
• Displacement and annihilation of Dirac gap-nodes in d-wave iron-based superconductors
• Crossover from spin-waves to diffusive spin excitations in underdoped Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Theory of tunnelling into a multi-band superconductor: decoherence and interference
• Role of Degeneracy, Hybridization, and Nesting in the Properties of Multi-Orbital Systems
• Correlated electronic structure, orbital-dependent correlations, and Lifshitz transition in tetragonal FeS
• Functional renormalization group for commensurate antiferromagnets: Beyond the mean-field picture
• Implicit renormalization approach to the problem of Cooper instability
• Order parameter fluctuation and ordering competition in $\mathrm{B}{\mathrm{a}}_{1-\mathrm{x}}{\mathrm{K}}_{\mathrm{x}}\mathrm{F}{\mathrm{e}}_2\mathrm{A}{\mathrm{s}}_2$
• Superconductivity and normal state properties of single-crystalline Tl0.47Rb0.34Fe1.63Se2 as seen via 77Se and 87Rb NMR
• Superconductivity in iron silicide Lu2Fe3Si5 probed by radiation-induced disordering
• Collective magnetic excitations of $C_4$ symmetric magnetic states in iron-based superconductors
• Origin of the non-monotonic variance of Tc in the 1111 iron based superconductors with isovalent doping
• Effect of Co Impurities on Superconductivity of FeSe0.4Te0.6 single crystals
• Shape resonance at a Lifshitz transition for high temperature superconductivity in multiband superconductors
• Coherence Effect of Sign-Reversing s(+-)-wave Cooper Pair State in Heavily Overdoped LaFeAsO-based Superconductor: 75As-Nuclear Quadrupole Resonance
• 75As-NMR Studies of LaFeAsO1-xFx for Various x Values
• Scaling of nascent nodes in extended s-wave superconductors
• Model for the inverse isotope effect of FeAs-based superconductors in the $\pi$-phase-shifted pairing state
• Thermodynamic signatures of an antiferromagnetic quantum critical point inside a superconducting dome
• Spin dynamics in electron-doped pnictide superconductors
• Effect of SDW fluctuations on the specific heat jump in iron pnictides at a superconducting transition
• On the Spatial Locality of Electronic Correlations in LiFeAs
• Ground state pairing correlations in the $S_4$ symmetric microscopic model for iron-based superconductors
• General theory of robustness against disorder in multi-band superconductors
• Consistent picture for the electronic structure around a vortex core in iron-based superconductors
• Role of Magnetism in Superconductivity of BaFe2As2: Study of 5d Au-doped Crystals
• Magnetic correlations and pairing in the 1/5-depleted square lattice Hubbard model
• Searching for topological density wave insulators in multi-orbital square lattice systems
• Electronic structure and two-band superconductivity in unconventional high-$T_c$ cuprates Ba${}_2$CuO${}_{3+\delta }$
• Antiferromagnetism in Iron-Based Superconductors: Selection of Magnetic Order and Quasiparticle Interference
• Distortional weak-coupling instability of Bogoliubov Fermi surfaces
• Andreev bound states in iron pnictide superconductors
• Structural, electronic, and dynamical properties of the tetragonal and collapsed tetragonal phases of KFe${}_2$As${}_2$
• Josephson current and density of states in proximity circuits with s+- superconductors
• Orbital superconductivity, defects and pinned nematic fluctuations in the doped iron chalcogenide FeSe${}_{0.45}$Te${}_{0.55}$
• Large $D-2$ Theory of Superconducting Fluctuations in a Magnetic Field and its Application to Iron-Pnictides
• Superconductivity in a single layer alkali-doped FeSe: a weakly coupled two-leg ladder system
• Single vortex structure in two models of iron pnictide $s^{\pm }$ superconductivity
• Review of nuclear magnetic resonance studies on iron-based superconductors
• Disentangling superconducting and magnetic orders in NaFe_1-xNi_xAs using muon spin rotation
• Post-quench gap dynamics of two-band superconductors
• Exotic pairing symmetry of interacting Dirac fermions on a $\pi$ flux lattice
• Optical properties of the iron-chalcogenide superconductor FeTe0.55Se0.45
• Raman resonance in iron-based superconductors: The magnetic scenario
• Robust accidental nodes and zeroes and critical quasiparticle scaling in iron-based multiband superconductors
• Effect of proton irradiation on the normal state low-energy excitations of Ba(Fe${}_{1-x}$Rh${}_x$)${}_2$As${}_2$ superconductors
• Structure of the pairing gap from orbital nematic fluctuations
• Effective three-particle interactions in low-energy models for multiband systems
• Spatial competition of the ground states in 1111 iron pnictides
• Fluctuations and pairing in Fe-based superconductors: Light scattering experiments
• $B_{1g}$-like pairing states in two-leg ladder iron superconductors
• Summing parquet diagrams using the functional renormalization group: X-ray problem revisited
• Green function theory of dirty two-band superconductivity
• Superconducting gap structure of the 115's revisited
• Orbital loop currents in iron-based superconductors
• Impact of ordering competition on the global phase diagram of iron pnictides
• Interorbital pair scattering in clean and impure superconductors
• Superconducting properties of (Ba-K)Fe2As2 single crystals disordered with fast neutron irradiation
• Coherence Temperature in the Diluted Periodic Anderson Model
• Excitonic Instabilities and Insulating States in Bilayer Graphene
• The Crossover from Ordinary to Higher-Order van Hove Singularity in a Honeycomb System: A Parquet Renormalization Group Analysis
• Pressure effects on strained FeSe0.5Te0.5 thin films
• Electronic structure, lattice dynamics and magnetism of new ThXAsN (X=Fe,Co,Ni) superconductors: A First Principles Study
• Electronic dispersion anomalies in the iron pnictide superconductor Ba_{1-x}K_xFe_2As_2
• Quantum critical behavior driven by Hund's rule coupling in quantum antiferromagnets
• Incommensurate inter-valley coherent states in ABC graphene: collective modes and superconductivity
• Fate of density waves in the presence of a higher order van Hove singularity
• Pairing mechanism for nodal $s$-wave superconductivity in BaFe${}_2$(As,P)${}_2$: Analysis beyond Migdal-Eliashberg formalism
• Magnetic penetration depth in the presence of a spin-density wave in multiband superconductors at zero temperature
• Orbital-selective coherence-incoherence crossover and metal-insulator transition in Cu-doped NaFeAs
• Quasiparticle Interference in Fe-based Superconductors Based on a Five-Orbital Tight-Binding Model
• Quasiparticle Interference and Symmetry of Superconducting Order Parameter in Strongly Electron-Doped Iron-based Superconductors
• Unified picture of superconductivity and magnetism in CeRh${}_2$As${}_2$
• Anomalous Zeeman response in coexisting phase of superconductivity and spin-density wave as a probe of extended $s$-wave pairing structure in ferro-pnictide
• Suppression of superconductivity by spin fluctuations in iron-based superconductors
• Reply to "Comment on 'Isotope effect in high-Tc superconductors' "
• Two-Fluid Description for Iron-Based Superconductors
• Is the nature of magnetic order in copper-oxides and in iron-pnictides different?
• Tuning the interplay between nematicity and spin fluctuations in Na${}_{1-x}$Li${}_x$FeAs superconductors
• Static and Dynamical Susceptibility of LaO1-xFxFeAs
• Proposal to determine the Fermi-surface topology of a doped iron-based superconductor using bulk-sensitive Fourier-transform Compton scattering
• THz electrodynamics of BaFe${}_{1.91}$Ni${}_{0.09}$As${}_2$ film analyzed in the framework of multiband Eliashberg theory
• Pairing mechanism in Fe pnictide superconductors
• Fate of the Hebel-Slichter peak in superconductors with strong antiferromagnetic fluctuations
• Itinerant scenario for Fe-pnictides: comparison with quantum Monte Carlo
• Theoretical study on the correlation between the spin fluctuation and $T_c$ in the isovalent-doped 1111 iron-based superconductors
• The effect of spin fluctuations on the electronic structure in iron based superconductors
• Zigzag chain structure transition and orbital fluctuations in Ni-based superconductors
• Modeling unconventional superconductivity at the crossover between strong and weak electronic interactions
• Magnetic and Quasiparticle Excitation Spectra of an Itinerant $J_1-J_2$ Model for Iron Pnictide Superconductors
• The effect of disorder on electronic Raman scattering in the superconducting state of iron pnictides
• Disorder-dependent superconducting pairing symmetry in doped graphene
• Comment on "Isoelectronic Ru substitution at Fe-site in Sm(Fe${}_{1-x}$Ru${}_x$)AsO${}_{0.85}$F${}_{0.15}$ compound and its effects on structural, superconducting and normal state properties" (arXiv:1004.1978)
• Change of the vortex core structure in two-band superconductors at impurity-scattering-driven $s_{\pm }/s_{++}$ crossover
• Effects of the vortices and impurities on the nuclear spin relaxation rate in iron-based superconductors
• Role of Fermi surface anisotropy in the study of gap anisotropy using magnetic-field-angle dependence of thermal oscillations in AyFe2-xSe2 superconductors
• Hierarchy of relevant couplings in perturbative renormalization group transformations
• High-Tc Superconductivity in Ultra-thin Crystals: Implications for Microscopic Theory
• Role of fluctuations for density-wave instabilities: Failure of the mean-field description
• Doping effects on electronic states in electron-doped FeSe: Impact of self-energy and vertex corrections
• Possible high temperature odd parity superconductivity in LaNi${}_{7/8}$Co${}_{1/8}$O${}_3$ (111) bilayers
• Identifying the dominant pairing interaction in high-$T_c$ FeSe superconductors through Leggett modes
• Mismatch of conductivity anisotropy in the mixed and normal states of type-II superconductors
• Quasiparticle interference in multiband superconductors with strong coupling
• Incommensurate magnetic states induced by ordering competition in $\mathrm{B}{\mathrm{a}}_{1-\mathrm{x}}\mathrm{N}{\mathrm{a}}_{\mathrm{x}}\mathrm{F}{\mathrm{e}}_2\mathrm{A}{\mathrm{s}}_2$
• Roles of anisotropic and unequal gaps in the quasiparticle interference of superconducting iron pnictides
• Exploring multichannel superconductivity in ThFeAsN
• Possible coexistence of double-Q magnetic order and chequerboard charge order in the re-entrant tetragonal phase of Ba0.76K0.24Fe2As2
• Extended Nuclear Quadrupole Resonance Study of the Heavy-Fermion Superconductor PuCoGa${}_5$
• Orbital order from the on-site orbital attraction
• Superconductivity from purely repulsive interactions in the strong coupling approach : Application of the SU(2) slave-rotor theory to the Hubbard model
• Theories for charge-driven nematicity in kagome metals
• Specifics of impurity effects in ferropnictide superconductors
• The symplectic-N t-J model and s${}_{\pm }$ superconductors
• Effects of $c/a$ Anisotropy and Local Crystal Structure on Superconductivity in $A\mathrm{F}{\mathrm{e}}_2({\mathrm{As}}_{1-x}{\mathrm{P}}_x{)}_2$ ($A$=Ba${}_{1-y}$Sr${}_y$, Sr${}_{1-y}$Ca${}_y$ and Eu)
• Bilayer honeycomb lattice with ultracold atoms: Multiple Fermi surfaces and incommensurate spin density wave instability
• Magnetic disorder and gap symmetry in optimally electron doped Sr(Fe, Co)${}_2$As${}_2$ superconductor
• The structure of the superconducting high-pressure phase of Sc${}_3$CoC${}_4$
• Effect of inelastic scattering on the nuclear magnetic relaxation rate 1/T1T in iron-based superconductors
• Effect of the additional Se layer on the electronic structure of iron-based superconductor FeSe/SrTiO${}_3$
• Surface Nematic Order in Iron Pnictides
• Magnetic behaviour of dirty multiband superconductors near the upper critical field
• In-plane magnetic field vs. temperature phase diagram of a quasi-2D frustrated multiband superconductor
• Direct observation of the spin exciton in Andreev spectroscopy of iron-based superconductors
• Complete renormalization group calculation up to two-loop order of an effective two-band model for iron-based superconductors
• Two-bands superconductivity with intra- and interband pairing for synthetic superlattices
• Persistent Magnetism in Silver-doped BaFe2As2 Crystals
• Orbital-transverse density-wave instabilities in iron-based superconductors
• Odd-Parity Magnetism in Fe-Based Superconductors
• Renormalization-group exponents for superconducting phases in two-leg ladders
• Effect of pairing fluctuations on the spin resonance in Fe-based superconductors
• Coupled Magnetic and Superconducting Transitions in Sr${}_2$VO${}_3$FeAs Under Pressure
• Evidence for bosonic mode coupling in electron dynamics of LiFeAs superconductor
• Theory of Andreev reflection in a two-orbital model of iron-pnictide superconductors
• Itinerant fermions on a triangular lattice: unconventional magnetism and other ordered states
• Low-energy spin excitations in optimally doped CaFe${}_{0.88}$Co${}_{0.12}$AsF superconductor studied with inelastic neutron scattering
• Microscopic Mechanism of Pair-, Charge- and Spin-Density-Wave Instabilities in Interacting D-Dimensional Fermi Liquids
• Field-induced coexistence of $s_{++}$ and $s_{\pm }$ superconducting states in dirty multiband superconductors
• Intertwined superconductivity and orbital selectivity in a three-orbital Hubbard model for the iron pnictides
• Electron-hole pairing of Fermi-arc surface states in a Weyl-semimetal bilayer
• Conductance spectrum and superconducting gap structures observed in c-axis FeSe0.3Te0.7/Au junctions
• Order parameter sign-reversal near $s_{\pm }$-superconductor surface
• Metallicity of Ca2Cu6P5 with Single and Double Copper-Pnictide Layers
• Superconductivity with repulsion: a variational approach
• Coupled multiple-mode theory for $s_{\pm }$ pairing mechanism in iron based superconductors
• Visualization of defect-induced interband proximity effect at the nanoscale
• Coherence effect in a two-band superconductor: Application to iron pnictides
• Nonequilibrium control of kagome metals
• Effect of Impurities with Internal Structure on Multiband Superconductors - Possible Enhancement of Transition Temperature -
• Evolution of superconducting gap anisotropy in hole-doped 122 iron pnictides
• Sn${}_{0.06}$Cr${}_3$Te${}_4$: A Skyrmion Superconductor
• Robust $s_{\pm }$-wave superconductivity against multi-impurity in iron-based superconductors
• Nested Fermi surfaces and correlated electronic phases in hole-doped semiconductor quantum wells
• Van-Hove tuning of Fermi surface instabilities through compensated metallicity
• Multiple superconducting gap and anisotropic spin fluctuations in iron arsenides: Comparison with nickel analog
• Probing superconductivity and pairing symmetry by coherent phonons in multiorbital superconductors
• Kekulé order from diffuse nesting near higher-order Van Hove points
• Magnetic excitations in the normal and nematic phases of iron pnictides
• Anomalous impurity effect in the heavy-fermion superconductor CeCu2Si2
• The $s\pm$ pairing symmetry in the pressured La${}_3$Ni${}_2$O${}_7$ from electron-phonon coupling
• Interrupted orbital motion in density-wave systems
• A Short Review of the $S_4$ Symmetric Microscopic Model for Iron-Based High Temperature Superconductors
• PhD Thesis: Electronic correlations in multiorbital systems
• Insulator-to-metal phase transition in Yb-based Kondo insulators
• Fate of a multiple-band Fermi liquid that is coupled with critical ${\varphi }^4$ bosons
• Interference Effect of Beam Splitter Current in Iron-Pnictide Superconductors
• Weak coupling theory of nickel-based 327 superconductors
• Differential conductance of point contacts between an iron-based superconductor and a normal metal
• Q Dependence of Magnetic Resonance Mode on FeTe${}_{0.5}$Se${}_{0.5}$ Studied by Inelastic Neutron Scattering