Dresden 2017 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 13: Superconductivity: Fe-based Superconductors - 122

TT 13.7: Talk

Monday, March 20, 2017, 16:45–17:00, HSZ 103

Nernst effect and thermal conductivity of Rh-doped BaFe₂As₂ — •Christoph Wuttke¹, Frank Steckel¹, Federico Caglieris¹, Seunghyun Kim¹, Sabine Wurmehl¹, Sheng Ran², Paul C. Canfield², Bernd Büchner^1,3,4, and Christian Hess^1,4 — ¹Leibniz-Institute for Solid State and Materials Research, IFW-Dresden, 01069 Dresden, Germany — ²Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA — ³Institut für Festkörperphysik, TU Dresden, 01069 Dresden, Germany — ⁴Center for Transport and Devices, Technische Universität Dresden, 01069 Dresden, Germany

We present results for the thermal conductivity and the Nernst coefficient of electron doped BaFe₂As₂ with a particular focus on exploring the nematic phase. The results show a significant sensitivity of both quantities with respect to nematic fluctuations. Interestingly, the magnitude of both the Nernst effect and the thermal conductivity exhibit a non-monotonic doping dependence where the strength of fluctuations feature a local maximum in the vicinity of optimal doping. These findings reinforce the notion that nematic fluctuations play a key role for rationalizing the nature of superconductivity in iron based superconductors.