Three-band s+- Eliashberg theory and the superconducting gaps of iron pnictides

Abstract

The experimental critical temperatures and gap values of the superconducting pnictides of both the 1111 and 122 families can be simultaneously reproduced within the Eliashberg theory by using a three-band model where the dominant role is played by interband interactions and the order parameter undergoes a sigh reversal between hole and electron bands (s+- wave symmetry). High values of the electron-boson coupling constants and small typical boson energies (in agreement with experiments) are necessary to obtain the values of all the gaps and to correctly reproduce their temperature dependence.

4 pages, 4 color figures, Revised version: Figs. 2, 3, 4 improved and some values in the text changed to correct few mistakes

References in corpus (10)

• Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
• Magnetic Order versus superconductivity in the Iron-based layered La(O1-xFx)FeAs systems
• Superconductivity at 22 K in Co-doped BaFe2As2 Crystals
• Observation of Fermi-surface-dependent nodeless superconducting gaps in Ba0.6K0.4Fe2As2
• Is LaO${}_{1-x}$F${}_x$FeAs an electron-phonon superconductor ?
• Electronic Structure of Prototype AFe_2As_2 and ReOFeAs High-Temperature Superconductors: a Comparison
• Interband superconductivity: contrasts between BCS and Eliashberg theory
• High Temperature Superconductivity in Transition Metal Oxypnictides: a Rare-Earth Puzzle?
• Point-contact Andreev-reflection spectroscopy in ReFeAsO_{1-x}F_x (Re = La, Sm): Possible evidence for two nodeless gaps
• Multiple Gaps and Superfluid Density from Interband Pairing in Iron Oxypnictides

Cited by in corpus (26)

• Probing multiband superconductivity by point-contact spectroscopy
• On the multi-orbital band structure and itinerant magnetism of iron-based superconductors
• Directional point-contact Andreev-reflection spectroscopy of Fe-based superconductors: Fermi surface topology, gap symmetry, and electron-boson interaction
• Multigap superconductivity and strong electron-boson coupling in Fe-based superconductors: A point-contact Andreev-reflection study of Ba(Fe1-xCox)2As2 single crystals
• Suppression of superconductivity by Neel-type magnetic fluctuations in the iron pnictides
• Experimental evidence for a two-band superconducting state of NbSe2 single crystals
• Spectroscopic and thermodynamic properties in a four-band model for pnictides
• Proximity and Josephson effects in microstructures based on multiband superconductors
• Unconventional Hall effect in pnictides from interband interactions
• Analysis of the London penetration depth in Ni-doped CaKFe4As4
• Superconducting phase fluctuations in SmFeAsO${}_{0.8}$F${}_{0.2}$ from diamagnetism at low magnetic field above $T_c$
• Mutual independence of critical temperature and superfluid density under pressure in optimally electron-doped superconducting LaFeAsO${}_{1-x}$F${}_x$
• Doping and critical-temperature dependence of the energy gaps in Ba(Fe_{1-x}Co_x)_2As_2 thin films
• Multiband strong-coupling superconductors with spontaneously broken time-reversal symmetry
• Effects of isoelectronic Ru substitution at the Fe site on the energy gaps of optimally F-doped SmFeAsO
• Lessons from Oxypnictide Thin Films
• Superconductivity of underdoped PrFeAs(O,F) investigated via point-contact spectroscopy and nuclear magnetic resonance
• Gap Anisotropy in Iron-Based Superconductors: A Point-Contact Andreev Reflection Study of BaFe${}_{2-x}$Ni${}_x$As${}_2$ Single Crystals
• A phenomenological multiband Eliashberg model for LiFeAs
• Constraints on the total coupling strength to bosons in iron based superconductors
• Point contact spectroscopy in Fe-based superconductors: recent advancements and future challenges
• Superconductivity by Hidden Spin Fluctuations in Electron-Doped Iron Selenide
• THz electrodynamics of BaFe${}_{1.91}$Ni${}_{0.09}$As${}_2$ film analyzed in the framework of multiband Eliashberg theory
• Normal and superconducting properties of LiFeAs explained in the framework of four-band Eliashberg Theory
• THz optical response of Ba(Fe${}_{1-x}$Ni${}_x$)${}_2$As${}_2$ films analyzed within the three-band Eliashberg s${}_{\pm }$-wave model
• Direct evidence for two-gap superconductivity in hydrogen-intercalated titanium diselenide