Evolution of the optical spectrum with doping in iron pnictides Ba(Fe1-xCox)2As2

Abstract

We investigated the optical spectrum of Ba(Fe1-xCox)2As2 single crystals with various doping levels. It is found that the low-energy optical conductivity spectrum of this system can be decomposed into two components: a sharp Drude term and a broad "incoherent" term. For the compounds showing magnetic order, a gap appears predominantly in the "incoherent" component, while an s-wave like superconducting gap opens in both components for highly doped compounds. The Drude weight steadily increases as doping proceeds, consistent with electron doping in this system. On the other hand, the "incoherent" spectral weight is almost doping independent, but its spectral feature is intimately connected with the magnetism. We demonstrate that the presence of two distinct components in the optical spectrum well explains the doping and temperature dependences of the dc resistivity.

10 pages, 10 figures, to be published in Phys. Rev. B

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Cited by in corpus (11)

• Magnetism and Charge Dynamics in Iron Pnictides
• Unprecedented anisotropic metallic state in BaFe2As2 revealed by optical spectroscopy
• Electrodynamics of electron doped iron-pnictide superconductors: Normal state properties
• Doping evolution of the absolute value of the London penetration depth and superfluid density in single crystals of Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Optical properties of the iron-arsenic superconductor BaFe1.85Co0.15As2
• Effect of Co doping on the in-plane anisotropy in the optical spectrum of underdoped Ba(Fe1-xCox)2As2
• Infrared Measurement of the Pseudogap in P-Doped and Co-Doped BaFe2As2 High-Temperature Superconductors
• Analysis of spin density wave conductivity spectra of iron pnictides in the framework of density functional theory
• Multi-gap superconductivity in a BaFe1.84Co0.16As2 film from optical measurements at terahertz frequencies
• Theoretical Investigation of Optical Conductivity in Ba [Fe(1-x)Co(x)]2 As2
• Optical properties of the iron-chalcogenide superconductor FeTe0.55Se0.45