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Berlin 2012 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 8: Superconductivity: Fe-based Superconductors - 122 Part 1

TT 8.1: Talk

Monday, March 26, 2012, 15:00–15:15, H 2053

Elastic anomalies in Ba(Fe1−xCox)2As2 — •Christoph Meingast1, Anna Böhmer1,2, Frederic Hardy1, Philipp Burger1,2, Peter Adelmann1, Doris Ernst1, Rainer Fromknecht1, Peter Schweiss1, Rolf Heid1, and Thomas Wolf11Karlsruhe Institute of Technology, Institute for Solid State Physics, 76021 Karlsruhe, Germany — 2Karlsruhe Institute of Technology, Fakultät für Physik, 76128 Karlsruhe, Germany

The elastic properties of Ba(Fe1−xCox)2As2 single crystals are studied using a three-point-bending arrangement in a capacitance dilatometer. In this novel setup, a constant pressure is applied and the elastic response is determined as a function of temperature. In the undoped compound we find a very large softening of the elastic response at the structural/magnetic transitions near 140 K. The high resolution of this setup allows us to distinguish the behavior at both transitions. The large softening for undoped crystals weakens with doping and in the overdoped crystals only the very small softening as usually seen in superconductors at Tc is observed. We discuss our results in light of recent ultrasound measurements [1,2].
R. M. Fernandes et al., Phys. Rev. Lett. 105, 157003 (2010).
Y. Yoshizawa et al., arXiv: 1111.0366

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