DPG Phi
Verhandlungen
Verhandlungen
DPG

Regensburg 2013 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

TT: Fachverband Tiefe Temperaturen

TT 27: Superconductivity: Fe-based Superconductors - 122

TT 27.7: Talk

Tuesday, March 12, 2013, 11:30–11:45, H18

Paramagnetic limiting of the upper critical field of KFe2As2 studied by low temperature thermal expansion and magnetostriction — •Diego A. Zocco1, Kai Grube1, Sebastian Zaum1, Felix Eilers1, Roland Schäfer1, Thomas Wolf1, Philipp Burger1, Frédéric Hardy1, Anna Böhmer1, Christoph Meingast1, and Hilbert von Löhneysen1,21Institut für Festkörperphysik, Karlsruhe Institute of Technology, D-76021 Karlsruhe, Germany — 2Physikalisches Institut, Karlsruhe Institute of Technology, D-76031 Karlsruhe, Germany.

We present low-temperature thermal expansion and magnetostriction measurements of single crystals of KFe2As2 (Tc ∼ 3.4 K) in magnetic fields up to 14 T applied parallel and perpendicular to the c-axis of the samples (Bc2c ∼ 1.5 T and Bc2ab ∼ 4.8 T). In the normal state, quantum oscillations of the sample length were observed for Bc and Bc, giving estimated mean-free-path values of 177 and 52 nm, respectively, indicating that the superconducting state can be described as being in the clean limit (ξ0ab ∼ 10 nm). While the superconducting state is limited by orbital pair-breaking effects when magnetic fields are applied parallel to the c-axis, our measurements confirm strong paramagnetic effects on Bc2(T) along the ab direction, as it was similarly found in other Fe-based materials such as LiFeAs and FeSe1−xTex.

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2013 > Regensburg