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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 Ba1−xNaxFe2As2 iron pnicdies studied by shear-modules measurements — •Liran Wang1, Frédéric Hardy1, Mingquan He1, Liping Xu1,2, Peter Schweiss1, Thomas Wolf1, and Christoph Meingast11Institute 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 Ba1−xNaxFe2As2[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 Ba1−xNaxFe2As2 does not follow a Curie-Weiss temperature dependence over the entire doping region, which is in contrary to the electron-doped Ba(Fe1−xCox)2As2 yet similar to its analogue Ba1−xKxFe2As2[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)

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