Optical Study of LaO_0.9F_0.1FeAs: Evidence for a Weakly Coupled Superconducting State

Abstract

We have studied the reflectance of the recently discovered superconductor LaO_0.9F0.FeAs in a wide energy range from the far infrared to the visible regime. We report on the observation of infrared active phonons, the plasma edge (PE) and possible interband transitions. On the basis of this data and the reported in-plane penetration depth lambda_L(0) about 254 nm [H. Luetkens et al., Phys. Rev. Lett. v. 101, 0970009 (2008)] a disorder sensitive relatively small value of the total electron electron-boson coupling constant lambda_tot=lambda_e-ph+lambda_e-sp ~ 0.6 +- 0.35 can be estimated adopting an effective single-band picture.

Changed title, updated references, final published version

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Cited by in corpus (6)

• Optical conductivity and Raman scattering of iron superconductors
• Unconventional Hall effect in pnictides from interband interactions
• Extended Drude model and role of interband transitions in the mid-infrared spectra of pnictides
• Analysis of spin density wave conductivity spectra of iron pnictides in the framework of density functional theory
• Conventional Superconductivity in Fe-Based Pnictides: the Relevance of Intra-Band Electron-Boson Scattering
• Upper critical field, critical current density and thermally activated flux flow in CaFFe0.9Co0.1As superconductor