Regensburg 2019 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 49: Poster Session: Superconductivity
TT 49.14: Poster
Wednesday, April 3, 2019, 15:00–18:30, Poster D
The nematic phase of LaFe1−xCoxAsO single crystals probed by thermodynamic methods — •Francesco Scaravaggi1,2, Sven Sauerland3, Rhea Kappenberger1,2, Liran Wang3, Saicharan Aswartham1, Sabine Wurmehl1, Rüdiger Klingeler3, Anja U. B. Wolter1, and Bernd Büchner1,2 — 1Leibniz-Institute for Solid State and Materials Research, IFW Dresden, Dresden, Germany — 2Institute for Solid State Physics, TU Dresden, Dresden, Germany — 3Kirchhoff Institute for Physics, Heidelberg University, Heidelberg, Germany
The phase diagram of electron doped LaFeAsO has been extensively studied on polycrystalline samples, showing significant differences when compared with other members of the FeAs family. The electronic nematic phase present in the parent compound, gradually suppressed by doping, appears to be separated from the emerging superconducting phase by a fairly abrupt transition. The interplay between these two phases in Iron-based superconductors as well as the origin of the nematic order are still under debate. By measuring single crystalline samples [1], we report the study of the evolution of the nematic phase in LaFeAsO as a function of Co doping by magnetization, specific heat and thermal expansion measurements. Macroscopic faceted single crystals allow us to effectively trace the structural order parameter (δ) as a function of temperature and doping by high resolution dilatometry.
R. Kappenberger et al., J. Cryst. Growth 483, 9 (2018)