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

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

2008-05-09

arxiv.org/abs/0805.1321v2

Phys. Rev. Lett. v. 101, 257004 (2008)

Physics

Condensed Matter

Superconductivity

Changed title, updated references, final published version

Scientific paper

10.1103/PhysRevLett.101.257004

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.

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