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 Scaravaggi2,3, Anja U.B. Wolter2, Rhea Kappenberger2,3, Saicharan Aswartham2, Sabine Wurmehl2, Steffen Sykora2, Federico Caglieris2, Christian Hess2, Bernd Büchner2,3, and Rüdiger Klingeler11Kirchhoff 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)

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