Journal
PHYSICAL REVIEW LETTERS
Volume 101, Issue 9, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.101.097011
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Funding
- Schweizer Nationalfonds (SNF) [200020-119784]
- Novel Electronic Properties-MaNEP
- Deutsche Forschungsgemeinschaft (DFG) [BE2684/1-3]
- Swiss National Science Foundation (SNF) [200020-119784] Funding Source: Swiss National Science Foundation (SNF)
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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. We deduce an upper limit of the c-axis superconducting plasma frequency of omega(SC)(pl,c) <= 260 cm(-1) corresponding to a lower limit of the c-axis magnetic penetration of lambda(c) >= 6 mu m and lambda(c)/lambda(ab) >= 30 as compared to lambda(ab) = 185 nm from muon spin rotation [A. Drew et al., arXiv:0805.1042 [Phys. Rev. Lett. (to be published)]]. We also observe a gaplike suppression of the conductivity in the superconducting state with a shoulderlike feature at omega(SC)* approximate to 300 cm(-1) and spectral shape which is consistent with an unconventional order parameter with 2 Delta approximate to omega(SC)* approximate to 37 meV.
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