Orbital Fluctuation Mediated Superconductivity in Iron Pnictides: Analysis of Five Orbital Hubbard-Holstein Model

Abstract

In iron pnictides, we find that the moderate electron-phonon interaction due to the Fe-ion oscillation can induce the critical d-orbital fluctuations, without being prohibited by the Coulomb interaction. These fluctuations give rise to the strong pairing interaction for the s-wave superconducting (SC) state without sign reversal ($s_{++}$-wave state), which is consistent with experimentally observed robustness of superconductivity against impurities. When the magnetic fluctuations due to Coulomb interaction are also strong, the SC state shows a smooth crossover from the s-wave state with sign reversal ($s_{\pm }$-wave state) to the $s_{++}$-wave state as impurity concentration increases.

5 pages, discussions have been added, to be published in PRL

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• Intertwined Spin and Orbital Density Waves in MnP Uncovered by Resonant Soft X-ray Scattering
• Quasiparticle Interference in Fe-based Superconductors Based on a Five-Orbital Tight-Binding Model
• Superconductivity and fluctuation in Ba${}_{1-p}$K${}_p$Fe${}_2$As${}_2$ and Ba(Fe${}_{1-n}$Co${}_n$)${}_2$As${}_2$
• Interrelationships between nematicity, antiferromagnetic spin fluctuations and superconductivity: Role of hotspots in FeSe${}_{1-x}$S${}_x$ revealed by high pressure ${}^{77}$Se NMR study
• Pairing mechanism for nodal $s$-wave superconductivity in BaFe${}_2$(As,P)${}_2$: Analysis beyond Migdal-Eliashberg formalism
• Impurity effect and suppression to superconductivity in Na(Fe${}_{0.97-x}$Co${}_{0.03}$T${}_x$)As (T=Cu, Mn)
• Pairing mechanism in Fe pnictide superconductors
• Local correlation effects on the s+-- and s++-wave superconductivities mediated by magnetic and orbital fluctuations in the 5-orbital Hubbard model for iron pnictides
• Phase Transition in IrTe${}_2$ induced by spin-orbit coupling
• Spectroscopic evidence of nematic fluctuations in LiFeAs
• Isostructural spin-density-wave and superconducting gap anisotropies in iron-arsenide superconductors
• Pairing enhanced by local orbital fluctuations in a model for monolayer FeSe
• Dispersionless orbital excitations in (Li,Fe)OHFeSe superconductors
• Orbital-Selective High-Temperature Cooper Pairing Developed in the Two-Dimensional Limit
• Maximum entropy analytic continuation of anomalous self-energies
• Pressure induced renormalization of energy scales in the unconventional superconductor FeTe0.6Se0.4
• Zigzag chain structure transition and orbital fluctuations in Ni-based superconductors
• Nematicity, magnetic fluctuation and ferro-spin-orbital ordering in BaFe${}_2$As${}_2$ family
• Theory of Mixed-State Effect on Quasiparticle Interference in Iron-based Superconductors
• Theoretical approach to resonant inelastic x-ray scattering in iron-based superconductors at the energy scale of the superconducting gap
• Origin of pressure induced second superconducting dome in AyFe2-xSe2 [A=K, (Tl,Rb)]
• Universal relationship between low-energy antiferromagnetic fluctuations and superconductivity in BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$
• Doping effects on electronic states in electron-doped FeSe: Impact of self-energy and vertex corrections
• Q-scan-analysis of the neutron scattering in iron-based superconductors
• Identifying the dominant pairing interaction in high-$T_c$ FeSe superconductors through Leggett modes
• Response Theory of the Electron-Phonon Coupling
• Nematic and time-reversal breaking superconductivities coexisting with quadrupole order in a ${\Gamma }_3$ system
• Multi-band Eilenberger theory of superconductivity: Systematic low-energy projection
• Observation of strong-coupling pairing with weakened Fermi-surface nesting at optimal hole doping in Ca${}_{0.33}$Na${}_{0.67}$Fe${}_2$As${}_2$
• Roles of anisotropic and unequal gaps in the quasiparticle interference of superconducting iron pnictides
• Atomic-scale coexistence of short-range magnetic order and superconductivity in Fe${}_{1+y}$Se${}_{0.1}$Te${}_{0.9}$
• Evidence of a multiple boson emission in Sm${}_{1-x}$Th${}_x$OFeAs
• Simplicity out of complexity: band structure for W${}_{20}$O${}_{58}$ superconductor
• Three-dimensional bond-order instability in infinite-layer nickelates due to nonlocal quantum interference
• Repulsive interaction helps superconductivity in fullerides
• Anomalous momentum dependence of the multiband electronic structure of FeSe_1-xTe_x superconductors induced by atomic disorder
• Doping evolution of the gap structure and spin-fluctuation pairing in $Ba(F{e}_{1-x}C{o}_x{)}_{2}A{s}_2$ superconductors
• Direct Evidence of Two Superconducting Gaps in FeSe${}_{0.5}$Te${}_{0.5}$: SnS-Andreev Spectroscopy and Lower Critical Field
• Spin and charge susceptibilities of the two-orbital model within the cluster perturbation theory for Fe-based materials
• Superconductivity on the verge of electronic topological transition in Fe based superconductors
• Anisotropic inplane spin correlation in the parent and Co-doped BaFe2As2: a neutron scattering study
• Coexistence of Antiferromagnetism and Superconductivity in Iron-Based Superconductors
• Angle-resolved photoemission studies of the superconducting gap symmetry in Fe-based superconductors
• Orbital-dependent modulation of the superconducting gap in uniaxially strained Ba${}_{0.6}$K${}_{0.4}$Fe${}_2$As${}_2$
• Anomalous Superconducting-Gap Structure of Slightly Overdoped Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Effect of the additional Se layer on the electronic structure of iron-based superconductor FeSe/SrTiO${}_3$
• Mössbauer studies of spin- and charge-modulations in BaFe2(As1-xPx)2
• Diverse Exotic Orders and Fermiology in Fe-based Superconductors: A Unified Mechanism for $B_{1g}/B_{2g}$ Nematicity in FeSe/(Cs,Rb)Fe${}_2$As${}_2$ and Smectic Order in BaFe${}_2$As${}_2$
• Staggered FeSe Monolayer on SrTiO${}_3$ (110) surface
• Uniform impurity scattering in two-band $s_{\pm }$ and $s_{++}$ superconductors
• Anisotropy of the superconducting fluctuations in multiband superconductors: the case of LiFeAs
• Mapping out the spin fluctuations in Co-doped LaFeAsO single crystals by NMR
• Signatures of unconventional pairing in near-vortex electronic structure of LiFeAs
• Magnetic disorder and gap symmetry in optimally electron doped Sr(Fe, Co)${}_2$As${}_2$ superconductor
• Effect of inelastic scattering on the nuclear magnetic relaxation rate 1/T1T in iron-based superconductors
• Hole-$s_{\pm }$ State Induced by Coexisting Ferro- and Aniferromagnetic and Aniferro-orbital Fluctuations in the Iron Pnictides
• Classification of multiorbital superconducting state based on augmented multipoles
• Decisive proofs of the $s_{\pm }\to s_{++}$ transition in the temperature dependence of the magnetic penetration depth
• Evidence for bosonic mode coupling in electron dynamics of LiFeAs superconductor
• The antiferromagnetic and phonon-mediated model of the NaFeAs, LiFeAs and FeSe superconductors
• Strong electron-boson coupling in the iron-based superconductor BaFe1.9Pt0.1As2 revealed by infrared spectroscopy
• Impurity effects on electronic transport in ferropnictide superconductors
• Orbital ordering transition in the single-layer manganites near half doping: a weak-coupling approach
• Modulation of pairing symmetry with bond disorder in unconventional superconductors
• Superconducting Gap and Symmetry in FeSe_1-x_Te_x_ Studied by Specific Heat in Magnetic Fields
• Suppression of superconductivity and structural phase transition against pressure in Ca${}_{10}$(Ir${}_4$As${}_8$)(Fe${}_{2-x}$Ir${}_x$As${}_2$)${}_5$
• Chiral superconductivity in nematic states
• Unified mechanism of charge-density-wave and high-$T_c$ superconductivity protected from oxygen vacancies in bilayer nickelates
• Role of interactions in the energy of the spin resonance peak in Fe-based superconductors
• Change of Fermi surface states related with two different $T_{\mathrm{c}}$-raising mechanisms in iron pnictide superconductor
• Optical Properties of Bogoliubov Quasiparticles
• Majorana edge states and topological properties in 1D/2D Rashba semiconductor proximity coupled to iron-based superconductor
• Coherence effect in a two-band superconductor: Application to iron pnictides
• Controlled pairing symmetry of the superfluid state in systems of three-component repulsive fermionic atoms in optical lattices
• Dispersion kinks from electronic correlations in an unconventional iron-based superconductor
• Comment on "Orbital Order, Structural Transition and Superconductivity in Iron Pnictides" [arXiv:1010.0129] by Yanagi et al
• Slow in-plane magnetoresistance oscillations in multiband quasi-two-dimensional metals
• Crystalline anisotropy induces a second antiferromagnetic phase in the absence of SDW in the heavily hydrogen-doped LaFeAsO${}_{1-x}$H${}_x$ $(x\sim 0.5)$
• Robust $T$-Linear Resistivity due to SU(4) Valley + Spin Fluctuation Mechanism in Magic Angle Twisted Bilayer Graphene
• Temperature-dependent local structure of superconducting BaPd${}_2$As${}_2$ and SrPd${}_2$As${}_2$
• Atomic-scale imaging of electronic nematicity in ferropnictides
• Dynamics of orbital degrees of freedom probed via isotope ${}^{121,123}$ Sb nuclear quadrupole moments in Sb-substituted iron-pnictide superconductors
• Superconducting Mechanism through direct and redox layer doping in Pnictides
• Supercurrent-induced antiferromagnetic order and spin-triplet pair generation in quantum critical d-wave superconductors
• Orbital Order in Two-orbital Hubbard Model
• Edwards-Anderson parameter and local Ising-nematicity in FeSe revealed via NMR spectral broadening
• Electronic Structure of ${\mathrm{Sr}}_{1-y}{\mathrm{Ca}}_y\mathrm{F}{\mathrm{e}}_2({\mathrm{As}}_{1-x}{\mathrm{P}}_x{)}_2$ ($x$ = 0.25, $y$ = 0.08) Revealed by Angle-Resolved Photoemission Spectroscopy
• Introduction to High-Temperature Superconductivity for Solid State Chemists
• Consistent picture of the octet-nodal gap and its evolution with doping in heavily overdoped Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$
• Probing superconductivity and pairing symmetry by coherent phonons in multiorbital superconductors
• Importance of both spin and orbital fluctuations in BaFe2(As1-xPx)2 : Evidence from superconducting gap anisotropy
• Impurity-induced smearing of the spin resonance peak in Fe-based superconductors
• Robust determination of superconducting gap sign changes via quasiparticle interference
• Fragile pressure-induced magnetism in FeSe superconductors with a thickness reduction
• Fe-vacancy ordered Fe4Se5: The insulating parent phase of FeSe superconductor
• Orbital-lattice coupling and orbital ordering instability in iron pnictides
• Q Dependence of Magnetic Resonance Mode on FeTe${}_{0.5}$Se${}_{0.5}$ Studied by Inelastic Neutron Scattering
• Band-dependent superconducting gap in SrFe${}_2$(As${}_{0.65}$P${}_{0.35}$)${}_2$ studied by angle-resolved photoemission spectroscopy
• Band structure of organic-ion-intercalated (EMIM)${}_x$FeSe superconductor