Electrodynamics of electron doped iron-pnictide superconductors: Normal state properties

Abstract

The electrodynamic properties of Ba(Fe${}_{0.92}$Co${}_{0.08}{)}_2$As${}_2$ and Ba(Fe${}_{0.95}$Ni${}_{0.05}{)}_{A}s$_{2}$singlecrystalshavebeeninvestigatedbyreflectivitymeasurementsinawidefrequencyrange.Inthemetallicstate,theopticalconductivityconsistsofabroadincoherentbackgroundandanarrowDrude-likecomponentwhichdeterminesthetransportproperties;onlythelattercontributionstronglydependsonthecompositionandtemperature.Thissubsystemrevealsa$T^2$behaviorinthedcresistivityandscatteringratedisclosingahiddenFermi-liquidbehaviorinthe122iron-pnictidefamily.AnextendedDrudeanalysisyieldsthefrequencydependenceoftheeffectivemass(with$m^*/m_b\approx 5$ in the static limit) and scattering rate that does not disclose a simple power law. The spectral weight shifts to lower energies upon cooling; a significant fraction is not recovered within the infrared range of frequencies.

13 pages, 9 figures

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Cited by in corpus (5)

• Optical properties of the iron-arsenic superconductor BaFe1.85Co0.15As2
• Anisotropic quasiparticle lifetimes in Fe-based superconductors
• Extended Drude model and role of interband transitions in the mid-infrared spectra of pnictides
• Eliashberg Analysis of Optical Spectra Reveals Strong Coupling of Charge Carriers to Spin Fluctuations in Superconducting Iron Pnictides
• Optical properties of the iron-chalcogenide superconductor FeTe0.55Se0.45