Is LaO${}_{1-x}$F${}_x$FeAs an electron-phonon superconductor ?

Abstract

In this paper we calculate the electron-phonon coupling of the newly-discovered superconductor LaO${}_{1-x}$F${}_x$FeAs from first-principles, using Density Functional Perturbation Theory. For pure LaOFeAs, the calculated electron-phonon coupling constant $\lambda =0.21$ and logarithmic-averaged frequency ${\omega }_{ln}=206K$, give a maximum $T_c$ of 0.8 K, using the standard Migdal-Eliashberg theory. For the $F-$doped compounds, we predict even smaller coupling constants, due to the strong suppression of the electronic Density of States at the Fermi level. To reproduce the experimental $T_c=26K$, a 5-6 times larger coupling constant would be needed. Our results indicate that electron-phonon coupling is not sufficient to explain superconductivity in the newly-discovered LaO${}_{1-x}$F${}_x$FeAs superconductor, probably due to the importance of strong correlation effects.

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• Phase competition in a one-dimensional three-orbital Hubbard-Holstein model
• Physics picture from neutron scattering study on Fe-based superconductors
• Optical and Hidden Transport Properties of BaFe${}_{1.91}$Ni${}_{0.09}$As${}_2$ Film
• Prediction of superconductivity of $3d$ transition-metal based antiperovskites via magnetic phase diagram
• Low-Energy Quasiparticles Probed by Heat Transport in the Iron Based Superconductor LaFePO
• Electronic dispersion anomalies in the iron pnictide superconductor Ba_{1-x}K_xFe_2As_2
• Positron potential and wavefunction in LaFeAsO
• Doping dependence of antiferromagnetism in models of the pnictides
• Gap Anisotropy in Iron-Based Superconductors: A Point-Contact Andreev Reflection Study of BaFe${}_{2-x}$Ni${}_x$As${}_2$ Single Crystals
• Magnetism dependent phonon anomaly in LaFeAsO observed via inelastic x-ray scattering
• Electronic structure, lattice dynamics and magnetism of new ThXAsN (X=Fe,Co,Ni) superconductors: A First Principles Study
• Constraints on the total coupling strength to bosons in iron based superconductors
• Anisotropic superconducting properties of aligned Sm${}_{0.95}$La${}_{0.05}$FeAsO${}_{0.85}$F${}_{0.15}$ microcrystalline powder
• High Field (14Tesla) Magneto Transport of Sm/PrFeAsO
• Raman scattering in iron-based superconductors
• Electronic structure and ultrafast dynamics of FeAs-based superconductors by angle- and time-resolved photoemission spectroscopy
• Fluctuation magnetoconductivity in pristine and protonirradiated Ca8.5La1.5(Pt3As8)(Fe2As2)5 single crystals
• Scaling of the Fano effect of the in-plane Fe-As phonon and the superconducting critical temperature in Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$
• Correlation effects in the electronic structure of the Ni-based superconducting KNi2S2
• Parallel suppression of superconductivity and Fe moment in the collapsed tetragonal phase of Ca0.67Sr0.33Fe2As2 under pressure
• Suppression of superconductivity by spin fluctuations in iron-based superconductors
• Electron-phonon coupling in the superconducting single crystal Rb${}_{0.8}$Fe${}_{1.68}$Se${}_2$
• Pressure effects on the electronic properties of the undoped superconductor ThFeAsN
• Competitions of magnetism and superconductivity in FeAs-based materials
• Superconductivity-induced Phonon Renormalization on NaFe${}_{1-x}$Co${}_x$As
• Pairing mechanism in Fe pnictide superconductors
• Static and Dynamical Susceptibility of LaO1-xFxFeAs
• The effect of spin fluctuations on the electronic structure in iron based superconductors
• Multiple energy gap features of superconducting FeSe investigated by tunneling spectroscopy
• Zigzag chain structure transition and orbital fluctuations in Ni-based superconductors
• Contrast of LiFeAs with isostructural, isoelectronic, and non-superconducting MgFeGe
• Orbital Selective Phase Transition
• Coexistence of Pairing Tendencies and Ferromagnetism in a Doped Two-Orbital Hubbard Model on Two-Leg Ladders
• A direct probe of the variability of Coulomb correlation in Fe-pnictide superconductors
• Constraints Imposed by Symmetry on Pairing Operators for the Pnictides
• Importance of Itinerancy and Quantum Fluctuations for the Magnetism in Iron Pnictides
• Vibrational anomalies in AFe${}_2$As${}_2$ (A$=$Ca, Sr, and Ba) single crystals
• Hybrid s-wave superconductivity in CrB${}_2$
• Contribution of the Electron-Phonon Coupling to the Pairing Interaction in LiFeAs
• Predictions of highest Transition-temperature for electron-phonon superconductors
• Magneto-elastic coupling in Fe-based superconductors
• Evidence of the isoelectronic character of F doping in SmFeAsO(1-x)F(x): a first-principles investigation
• Structural Phase Transition, Antiferromagnetism and Two Superconducting Domes in LaFeAsO${}_{1-x}$F${}_x$ (0 $<x\le$ 0.75)
• Absence of magnetism in the superconductor Ba2Ti2Fe2As4O: Insights from inelastic neutron scattering measurements and ab initio calculations of phonon spectra
• Anisotropic inplane spin correlation in the parent and Co-doped BaFe2As2: a neutron scattering study
• Resistivity in Co-doped Ba-122: comparison of thin films and single crystals
• Quasiparticle interference in multiband superconductors with strong coupling
• Specifics of impurity effects in ferropnictide superconductors
• Correlation effects in Ni 3d states of LaNiPO
• Spin density wave in oxypnictide superconductors in a three-band model
• Effective enhancement of the electron-phonon coupling driven by nonperturbative electronic density fluctuations
• Single 20meV boson mode in KFe2As2 detected by point-contact spectroscopy
• Doping dependence and electron-boson coupling in the ultrafast relaxation of hot electron populations in Ba(Fe_{1-x}Co_x)_2As_2
• Roles of anisotropic and unequal gaps in the quasiparticle interference of superconducting iron pnictides
• The uncollapsed LaFe2As2 phase: compensated, highly doped, electron-phonon coupled, iron-based superconductor
• Orbital-selective Mott phase of Cu-substituted iron-based Superconductors
• An effective mean field theory for the coexistence of anti-ferromagnetism and superconductivity: Applications to iron-based superconductors and cold Bose-Fermi atomic mixtures
• The giant effect of magnetic ordering on a sound velocity in a sigma-Fe55Cr45 alloy
• Complete renormalization group calculation up to two-loop order of an effective two-band model for iron-based superconductors
• Breaking of four-fold lattice symmetry in a model for pnictide superconductors
• Direct observation of the spin exciton in Andreev spectroscopy of iron-based superconductors
• Evidence for bosonic mode coupling in electron dynamics of LiFeAs superconductor
• Investigation of magnetic phases in parent compounds of Iron-chalcogenides via quasiparticle scattering interference
• Electronic structure and possible pseudogap behavior in iron based superconductors
• Influence of multiorbitals and anisotropic Coulomb interactions on isotope effect coefficient in doped Fe-based superconductors
• Inelastic x-ray scattering investigations of lattice dynamics in SmFeAsO${}_{1-x}$F${}_y$ superconductors
• A first principles study on FeAs single layers
• Breakdown of the Hund's Rule in CuFeAs
• Interplay of electron-phonon coupling, pseudogap, and superconductivity in CsCa${}_2$Fe${}_4$As${}_4$F${}_2$ studied using ultrafast optical spectroscopy
• Phase transition in CaFeAsH: bridging 1111 and 122 iron-based superconductors
• Effect of strain-induced orbital splitting on the magnetic excitations in undoped cuprates
• Unconventional superconductivity after the BCS paradigm and empirical rules for the exploration of high temperature superconductors
• High resolution Compton scattering as a Probe of the Fermi surface in the Iron-based superconductor $La{O}_{1-x}{F}_{x}FeAs$
• The role of orbital nesting in the superconductivity of Iron-based Superconductors
• Inelastic neutron and x-ray scattering as probes of the sign structure of the Fe-pnictide superconducting gap
• Lattice expansion from isotope substitution in the Iron based superconductors
• Optical and transport properties of Ba(Fe${}_{1-x}$Ni${}_x$)${}_2$As${}_2$ films
• Q Dependence of Magnetic Resonance Mode on FeTe${}_{0.5}$Se${}_{0.5}$ Studied by Inelastic Neutron Scattering
• Stripes and Pairing in High Temperature Superconductors
• Superconductor-Insulator transition in a two-orbital attractive Hubbard model with Hund's exchange
• Phonon Dispersion Relationship and Oxygen Isotope Effect in Superconductor LaFeAsO
• Orbital-lattice coupling and orbital ordering instability in iron pnictides