THz electrodynamics of BaFe${}_{1.91}$Ni${}_{0.09}$As${}_2$ film analyzed in the framework of multiband Eliashberg theory

Abstract

The temperature dependences of the plasma frequency, superfluid density and London penetration depth were determined from terahertz spectra of conductivity and dielectric permittivity of BaFe${}_{1.91}$Ni${}_{0.09}$As${}_2$ film with critical temperature $T_c=19.6$~K. Part of experimental data were analyzed within a simple three-band Eliashberg model where the mechanism of superconducting coupling is mediated by antiferromagnetic spin fluctuations, whose characteristic energy ${\Omega }_0$ scales with $T_c$ according to the empirical law ${\Omega }_0=4.65k_B{T}_c$, and with a total electron-boson coupling strength ${\lambda }_{tot}=2.17$.

15 pages, 6 figures

References in corpus (14)

• High-temperature superconductivity in iron-based materials
• Magnetism, superconductivity, and pairing symmetry in Fe-based superconductors
• Three-dimensional Resonance in superconducting BaFe${}_{1.9}$Ni${}_{0.1}$As${}_2$
• Momentum dependence and nodes of the superconducting gap in iron-pnictides
• Lifting of nodes by disorder in extended-$s$ state superconductors: application to ferropnictides
• Effects of magnetism and doping on the electron-phonon coupling in BaFe${}_2$As${}_2$
• Superfluid density and penetration depth in Fe-pnictides
• Crossover from weak to strong pairing in unconventional superconductors
• Optical signature of sub-gap absorption in the superconducting state of Ba(Fe,Co)2As2
• Comprehensive Eliashberg analysis of microwave conductivity and penetration depth of K-, Co-, and P-substituted BaFe2As2
• Anomalous diamagnetic response in multi-band superconductors with time-reversal broken symmetry
• Superconducting properties of Ba(Fe1-xNix)2As2 thin films in high magnetic fields
• Electrodynamic response of Ba(Fe1-xRhx)2As2 across the s+- to s++ order parameter transition
• Vortex Structure and Anisotropic Superconducting Gaps in Ba[Fe(Ni)]${}_2$As${}_2$

Cited by in corpus (3)

• Optical and Hidden Transport Properties of BaFe${}_{1.91}$Ni${}_{0.09}$As${}_2$ Film
• THz optical response of Ba(Fe${}_{1-x}$Ni${}_x$)${}_2$As${}_2$ films analyzed within the three-band Eliashberg s${}_{\pm }$-wave model
• Optical and transport properties of Ba(Fe${}_{1-x}$Ni${}_x$)${}_2$As${}_2$ films