Dresden 2014 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 30: Superconductivity - Poster Session

TT 30.36: Poster

Montag, 31. März 2014, 15:00–19:00, P2

Resistivity anisotropy measurements on Ca(Fe_1−xCo_x)₂As₂ — •Stephan Knöner¹, Bernd Wolf¹, Harald Schubert¹, Sheng Ran², Paul Canfield², and Michael Lang¹ — ¹Physikalisches Institut, J.W. Goethe-Universität, SPP 1458, D-60438 Frankfurt (Main), Germany — ²Ames Laboratory, Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA

Electronic nematicity has been discussed intensively in the research on iron-pnictide superconductors. Evidence for electronic nematicity has been reported from various experiments including magnetic torque measurements [1], scanning tunneling microscopy [2] as well as electronic transport [3]. The nematicity manifests itself in a strong anisotropy in electrical resistance of single crystals detwinned by the application of mild uniaxial strain [3]. Different experimental and theoretical studies support the idea that the transport anisotropy basically results from anisotropic scattering by dopant-induced impurity states [2]. In this contribution, we present measurements of the electrical resistance on detwinned high-quality single crystals of Ca(Fe_1−xCo_x)₂As₂ with different doping levels x. We discuss the size of the anisotropy, its dependence on the doping level and the effect of hydrostatic pressure tuning [4].
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