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Regensburg 2010 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 9: SC: Poster Session

TT 9.24: Poster

Monday, March 22, 2010, 14:00–18:00, Poster A

Electrodynamics of electron doped iron-pnictide superconductors Ba(Fe1−xMx)2As2 — •Dan Wu1, Neven Barisic1, Natalia Drichko1, Boris Gorshunov1, Philipp Kallina1, Martin Dressel1, Linjun Li2, Xiao Lin2, Guanghan Cao2, and Zhu-an Xu211. Physikalisches Institut, Universiät Stuttgart, Germany — 2Department of Physics, Zhejiang University, People’s Republic of China

The temperature dependence of the ab-plane optical reflectivity of Ba(Fe0.92Co0.08)2As2 and Ba(Fe0.95Ni0.05)2As2 single crystals is measured in a wide spectral range. In the metallic state, the optical conductivity consists of a broad incoherent background and a narrow Drude-like component which determines the transport properties; only the latter contribution strongly depends on the composition and temperature. Upon entering the superconducting regime, the conductivity below 100 cm−1 drops due to the complete opening a gap in the density of states at 2Δ/kBTc≈ 2.5−3. From the analysis of the complex conductivity spectra we obtain the penetration depth λ=(3500± 350) Å for Ba(Fe0.92Co0.08)2As2 and (3000± 300) Å for Ba(Fe0.95Ni0.05)2As2. The calculated superfluid density ρs of both compounds nicely fits the scaling relation ρs=(125± 25)σdcTc.

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