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Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 35: Superconductivity: Fe-based Superconductors - 122 and Theory

TT 35.1: Vortrag

Dienstag, 13. März 2018, 09:30–09:45, A 053

Soft phonons reveal finite nematic correlation length in Ba(Fe0.94Co0.06)2As2 — •Frank Weber1, Michael Merz1, Thomas Wolf1, Rafael Fernandes2, Jörg Schmalian1, and Dmitry Reznik31Institute for Solid State Physics, Karlsruhe Institute of Technology, Karlsruhe, Germany — 2School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota, 55455, USA — 3Department of Physics, University of Colorado at Boulder, Boulder, Colorado, 80309, USA

Nematicity is ubiquitous in electronic phases of high-Tc superconductors, particularly in the Fe-based systems. While several experiments have probed nematic fluctuations, they have either been restricted to uniform, i.e. q=0 fluctuations, or measure momentum-averaged effects. Here, we investigate the behavior of finite-momentum nematic fluctuations near q≈ 0 by utilizing the anomalous softening of transverse acoustic phonon modes in optimally doped Ba(Fe0.94Co0.06)2As2. We determine the nematic correlation length and find that it sharply changes its T-dependence at Tc, revealing a strong connection between nematicity and superconductivity.

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