Berlin 2012 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 2: Superconductivity: Fe-based Superconductors - 1111, LiFeAs & As-free Pnictides

TT 2.4: Vortrag

Montag, 26. März 2012, 10:15–10:30, H 2053

Critical current scaling and anisotropy in oxypnictide superconductors — Martin Kidszun¹, Jens Hänisch¹, Bernhard Holzapfel¹, Tom Thersleff^1,2, and •Silvia Haindl¹ — ¹IFW Dresden, Institute for Metallic Materials, P.O.Box 270116, 01171 Dresden, Germany — ²Department of Engineering Sciences, University of Uppsala, Box 534, 751 21 Uppsala, Sweden

Having succeeded in the fabrication of epitaxial superconducting La-1111 thin films we performed an extensive study of electrical transport properties [1]. We found that the anisotropic Ginzburg-Landau scaling approach can be applied to the angular dependent critical current densities and results in temperature dependent γ-values between 3 and 5. Originally, the anisotropic Ginzburg-Landau scaling approach was developed for a single band superconductor where γ denotes the mass anisotropy. In multiband superconductors the scaling parameter, γ, varies with temperature, however its interpretation as an effective mass anisotropy remains subtle. According to the temperature dependence of the upper critical field we present an explanation using two dominating electronic bands.
M. Kidszun et al., Phys. Rev. Lett. 106 (2011) 137001