Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

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].
S. Kasahara et al., Nature 486, 382 (2012)
M. P. Allan et al., Nature Physics 9, 220 (2013)
J. Chu et al., Science 329, 824 (2010)
E. Gati et al., PRB 86, 220511(R) (2012)