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TT: Fachverband Tiefe Temperaturen

TT 49: Poster Session: Superconductivity

TT 49.14: Poster

Mittwoch, 3. April 2019, 15:00–18:30, Poster D

The nematic phase of LaFe_1−xCo_xAsO single crystals probed by thermodynamic methods — •Francesco Scaravaggi^1,2, Sven Sauerland³, Rhea Kappenberger^1,2, Liran Wang³, Saicharan Aswartham¹, Sabine Wurmehl¹, Rüdiger Klingeler³, Anja U. B. Wolter¹, and Bernd Büchner^1,2 — 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)