Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 15: Superconductivity: Fe-based Superconductors - Other Materials and Theory

TT 15.6: Vortrag

Montag, 1. April 2019, 16:15–16:30, H23

Nematicity in BaFe₂As₂ and LaFeAsO single crystals studied by elastoresistance and shear modulus measurements — •Sven Sauerland¹, Xiaochen Hong², Liran Wang¹, Francesco Scaravaggi^2,3, Anja U.B. Wolter², Rhea Kappenberger^2,3, Saicharan Aswartham², Sabine Wurmehl², Steffen Sykora², Federico Caglieris², Christian Hess², Bernd Büchner^2,3, and Rüdiger Klingeler¹ — ¹Kirchhoff Institute for Physics, Heidelberg University, Germany — ²Leibniz Institute for Solid State and Materials Research, IFW Dresden, Dresden, Germany — ³Institute for Solid State Physics, TU Dresden, Germany

We report shear modulus and elastoresistivity measurements on LaFeAsO single crystals[1] and study the critical nematic response. The results are compared with corresponding data on BaFe₂As₂. In both materials, softening of the shear modulus towards the structural phase transition is observed by means of the three-point-bending technique and similar Curie-Weiss-like divergence of the nematic susceptibilities deduced from both the shear modulus and the elastoresistivity are found. The data are analysed by means of a Landau approach. Comparison of the bare and the renormalized nematic susceptibilities provides the characteristic energy of the coupling between the lattice and the electronic degrees of freedom. Nematic susceptibilities obtained from shear modulus and elastoresistivity data are compared for LaFeAsO and BaFe₂As₂.
R. Kappenberger et al., J. Cryst. Growth 483, 9 (2018)