Berlin 2015 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 110: Superconductivity: Fe-based Superconductors – Theory
TT 110.9: Vortrag
Freitag, 20. März 2015, 11:45–12:00, H 2053
Anisotropic transport properties of Ba-122 compounds calculated by the Kubo-formalism — •Gerald Derondeau1, Sebastian Wimmer1, Diemo Ködderitzsch1, Hubert Ebert1, and Ján Minár1,2 — 1Department Chemie, Ludwig-Maximilians-Universität München, 81377 München, Germany — 2NewTechnologies-Research Center, University of West Bohemia, Pilsen, Czech Republic
We have shown recently that the Korringa-Kohn-Rostoker-Green function (KKR-GF) method, in combination with the coherent potential approximation (CPA), indeed provides a very suitable platform to describe the impact of substitutional disorder on the electronic structure of iron pnictide superconductors. [1]
Based on this we focused on the resistivity anisotropy of Ba-122 compounds, which lately received tremendous interest. [2, 3]
We use the Kubo-formalism to calculate the longitudinal resistivity of doped Ba-122 compounds in their antiferromagnetic state within the framework of the local approximation to density-functional-theory. We are able to reproduce the unusual resistivity anomaly and investigate the transport behavior for different substitution types in BaFe2As2. The dependence of the transport properties on the type and the concentration of the dopant suggest a crucial influence of impurity scattering for the resistivity anomaly in iron pnictides.
[1] G. Derondeau et al., Phys. Rev. B 90, 184509 (2014).
[2] J.-H. Chu et al., Science 329, 824 (2010).
[3] S. Ishida et al., Phys. Rev. Lett. 110, 207001 (2013).