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Superconducting energy gap and c-axis plasma frequency of (Nd,Sm)FeAsO0.82F0.18 superconductors from infrared ellipsometry

Dubroka, Adam ; Kim, Kyung Wan ; Rössle, Matthias ; Malik, Vivek Kumar ; Drew, Alan J. ; Liu, R. H. ; Wu, G. ; Chen, X. H. ; Bernhard, Christian

In: Physical Review Letters, 2008, vol. 101, no. 9, p. 097011

We present far-infrared ellipsometric measurements of polycrystalline samples of the pnictide superconductor RFeAsO0.82F0.18 (R=Nd and Sm). We find evidence that the electronic properties are strongly anisotropic such that the optical spectra are dominated by the weakly conducting c-axis response similar to the cuprate high-temperature superconductors....