Berlin 2015 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 31: Superconductivity: Fe-based Superconductors – 122 and 111

TT 31.4: Talk

Tuesday, March 17, 2015, 10:30–10:45, H 2053

Suppressed thermal transport in Rh-doped BaFe₂As₂ — •Frank Steckel¹, Sheng Ran², Sergey L. Bud’ko², Paul C. Canfield², Bernd Buechner^1,3, and Christian Hess^1,3 — ¹Leibniz Institute for Solid State and Materials Research, IFW Dresden, 01069 Dresden — ²Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA — ³Center for Transport and Devices, TU Dresden, 01069 Dresden

We investigated Rh-doped BaFe₂As₂ by means of electrical and heat transport. The underdoped compounds show a clear suppression of phononic heat transport in the intermediate temperature regime above the structural transition temperature T_S and up to 170 K. We interprete this suppression as a strong indication towards electron-phonon coupling, spin-phonon coupling or lattice softening by nematic fluctuations above the structural transition. Additionally, strong anomalies mark the structural and superconducting transition.