Electron-Phonon Properties of Pnictide Superconductors

Abstract

In this paper we discuss the normal and superconducting state properties of two pnictide superconductors, LaOFeAs and LaONiAs, using Migdal-Eliashberg theory and 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. Inclusion of multiband effects increases the Tc only marginally. To reproduce the experimental $T_c$, a 5-6 times larger coupling constant would be needed. Our results indicate that standard electron-phonon coupling is not sufficient to explain superconductivity in the whole family of Fe-As based superconductors. At the same time, the electron-phonon coupling in Ni-As based compounds is much stronger and its normal and superconducting state properties can be well described by standard Migdal-Eliashberg theory.

Contribution to the special issue of the Physica C on Pnicitide superconductors

References in corpus (24)

• Unconventional sign-reversing superconductivity in LaFeAsO_(1-x)F_x
• LaFeAsO${}_{1-x}$F${}_x$: A low carrier density superconductor near itinerant magnetism
• Density functional study of FeS, FeSe and FeTe: Electronic structure, magnetism, phonons and superconductivity
• Is LaO${}_{1-x}$F${}_x$FeAs an electron-phonon superconductor ?
• The challenge of unravelling magnetic properties in LaFeAsO
• Electron-Hole Symmetry and Magnetic Coupling in Antiferromagnetic LaOFeAs
• A key role for unusual spin dynamics in ferropnictides
• Doping-dependent Phase Diagram of LaO{\it M}As ({\it M}=V--Cu) and Electron-type Superconductivity near Ferromagnetic Instability
• A Large Iron Isotope Effect in SmFeAsO1-xFx and Ba1-xKxFe2As2
• First Order Phase Transition and Superconductivity in BaNi2As2 Single Crystals
• Nickel-based layered superconductor, LaNiOAs
• Strong-coupling superconductivity in layered nickel-based LaO${}_{1-x}$F${}_x$NiAs
• Density functional study of BaNi${}_2$As${}_2$: Electronic structure, phonons and electron-phonon superconductivity
• Phonon Density of States of LaFeAsO1-xFx
• Lattice Dynamics of LaFeAsO_{1-x}F_{x} and PrFeAsO_{1-y} via Inelastic X-Ray Scattering and First-Principles Calculation
• Phonon Density of States in Nd(O${}_{1-x}$F${}_x$)FeAs
• Electron Phonon Superconductivity in LaNiOP
• Electron-phonon interaction in the three-band model
• Anomalous electron-phonon interaction in doped LaOFeAs: a First Principles calculation
• Temperature dependence and resonance effects in Raman scattering of phonons in NdFeAsO${}_x$F${}_{1-x}$ single crystals
• Optical Study of LaO_0.9F_0.1FeAs: Evidence for a Weakly Coupled Superconducting State
• Synthesizing and characterization of hole doped nickel based layer superconductor (La${}_{1-x}$Sr${}_x$)ONiAs
• Synthesizing and characterization of hole doped nickel based superconductor (La${}_{1-x}$Sr${}_x$)NiAsO
• Strong electron-phonon interaction in multiband superconductors

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• Phonon anomalies in pure and underdoped R{1-x}K{x}Fe{2}As{2} (R = Ba, Sr) investigated by Raman light scattering
• Fermi surface of SrFe${}_2$P${}_2$ determined by de Haas-van Alphen effect
• Spin excitations in the excitonic spin-density-wave state of the iron pnictides
• A de Haas-van Alphen study of the Fermi surfaces of superconducting LiFeP and LiFeAs
• Three-band s+- Eliashberg theory and the superconducting gaps of iron pnictides
• Nd induced Mn spin-reorientation transition in NdMnAsO
• Multi-gap superconductivity in single crystals of Ba${}_{0.65}$Na${}_{0.35}$Fe${}_2$As${}_2$: A calorimetric investigation
• Optical conductivity of iron-based superconductors
• Andreev spectroscopy of iron-based superconductors: temperature dependence of the order parameters and scaling of the ${\Delta }_{L,S}$ with $T_C$
• Specific Heat Discontinuity, deltaC, at Tc in BaFe2(As0.7P0.3)2 - Consistent with Unconventional Superconductivity
• Strong electron-phonon coupling and multiband effects in the superconducting $\beta$-phase Mo${}_{1-x}$Re${}_x$ alloys
• Close correlation between magnetic properties and the soft phonon mode of the structural transition in BaFe${}_2$As${}_2$ and SrFe${}_2$As${}_2$
• Anomalous High-Energy Electronic Interaction in Iron-Based Superconductor
• Investigation of LiFeAs by means of "Break-junction" Technique
• Interorbital pair scattering in clean and impure superconductors
• Prediction of superconductivity of $3d$ transition-metal based antiperovskites via magnetic phase diagram
• Anomalous Dome-like Superconductivity in RE2(Cu1-xNix)5As3O2(RE=La, Pr, Nd)
• Absence of magnetism in the superconductor Ba2Ti2Fe2As4O: Insights from inelastic neutron scattering measurements and ab initio calculations of phonon spectra
• Single 20meV boson mode in KFe2As2 detected by point-contact spectroscopy
• Correlation effects in Ni 3d states of LaNiPO
• Specific heat of Ba${}_{0.59}$K${}_{0.41}$Fe${}_2$As${}_2$, and a new method for identifying the electron contribution: two electron bands with different energy gaps in the superconducting state
• Influence of multiorbitals and anisotropic Coulomb interactions on isotope effect coefficient in doped Fe-based superconductors
• Electronic band structure, phonon spectrum, and elastic properties of LaOFeAs
• Unconventional superconductivity mediated solely by isotropic electron-phonon interaction