Optical and Hidden Transport Properties of BaFe${}_{1.91}$Ni${}_{0.09}$As${}_2$ Film

Abstract

Optical spectroscopy was used to study the electrodynamics and hidden transport properties of a BaFe${}_{1.91}$Ni${}_{0.09}$As${}_2$ thin superconducting film. We analyzed the normal state data using a Drude-Lorentz model with two Drude components: one narrow ($D_1$) and another broad one ($D_2$). In the superconducting state, two gaps with $2{\Delta }_0^{(2)}/k_B{T}_c=1.9$--2.0 and $2{\Delta }_0^{(1)}/k_B{T}_c=4.0$--4.3 are formed from the narrow component $D_1$ while the broad component $D_2$ remains ungapped. The calculated total DC resistivity of the film and the low-temperature scattering rate for the narrow Drude component show a hidden Fermi-liquid behavior. The change of total electron-boson coupling (${\lambda }_{tot}$) and representative energy (${\Omega }_0$) in the normal state with respect to the superconducting state is typical of other iron-based materials as well as high-temperature superconducting (HTSC) cuprates.

References in corpus (12)

• Is LaO${}_{1-x}$F${}_x$FeAs an electron-phonon superconductor ?
• Electronic Structure and Doping in BaFe${}_2$As${}_2$ and LiFeAs: Density Functional Calculations
• Three-dimensional Resonance in superconducting BaFe${}_{1.9}$Ni${}_{0.1}$As${}_2$
• Electrodynamics of electron doped iron-pnictide superconductors: Normal state properties
• Optical properties of the iron-arsenic superconductor BaFe1.85Co0.15As2
• Eliashberg Analysis of Optical Spectra Reveals Strong Coupling of Charge Carriers to Spin Fluctuations in Superconducting Iron Pnictides
• Superconducting properties of Ba(Fe1-xNix)2As2 thin films in high magnetic fields
• Vortex Structure and Anisotropic Superconducting Gaps in Ba[Fe(Ni)]${}_2$As${}_2$
• Role of electron-electron interactions in the charge dynamics of rare-earth-doped CaFe2As2
• THz electrodynamics of BaFe${}_{1.91}$Ni${}_{0.09}$As${}_2$ film analyzed in the framework of multiband Eliashberg theory
• Resistivity in Co-doped Ba-122: comparison of thin films and single crystals
• Strong electron-boson coupling in the iron-based superconductor BaFe1.9Pt0.1As2 revealed by infrared spectroscopy