Dresden 2017 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 13: Superconductivity: Fe-based Superconductors - 122

TT 13.2: Talk

Monday, March 20, 2017, 15:15–15:30, HSZ 103

Nematic susceptibility of hole-doped Ba_1−xNa_xFe₂As₂ iron pnicdies studied by shear-modules measurements — •Liran Wang¹, Frédéric Hardy¹, Mingquan He¹, Liping Xu^1,2, Peter Schweiss¹, Thomas Wolf¹, and Christoph Meingast¹ — ¹Institute für Festkörperphysik,Karlsruher Institut für Technologie (KIT), 76344 Karlsruhe, Germany — ²Key Laboratory of Polar Materials and Devices, Department of Electronic Engineering, East China Normal University, Shanghai 200241, China

In order to study the complex electronic phase diagram of hole-doped doped Ba_1−xNa_xFe₂As₂[1] iron based superconductor, we investigate the nematic susceptibility extracted from shear modulus data obtained using a three-point-bending method[2,3] in a capacitance dilatometer. Other complimentary measurements, including thermal expansion[4], specific heat, as well as transport, have also been performed on this system. We find that the nematic susceptibility of doped Ba_1−xNa_xFe₂As₂ does not follow a Curie-Weiss temperature dependence over the entire doping region, which is in contrary to the electron-doped Ba(Fe_1−xCo_x)₂As₂ yet similar to its analogue Ba_1−xK_xFe₂As₂[2]. In particular, we find a large increase of the nematic susceptibility upon entering the C4 magnetic phase.

[1] L. Wang et al., Phys. Rev. B 93, 014514 (2016)

[2] A. Böhmer et al., Phys. Rev. Lett. 112, 047001 (2014)

[3] A. Böhmer et al., Comptes Rendus Physique 17, 1-2, 90-112 (2016)

[4] C. Meingast et al, Phys. Rev. B 41, 11299 (1990)