Dresden 2020 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 54: Fe-based Superconductors
TT 54.5: Talk
Thursday, March 19, 2020, 10:30–10:45, HSZ 201
Elasto-Nernst effect: a sensitive probe for nematicity — •Federico Caglieris1, Xiaochen Hong1, Michael Wissmann1, Christoph Wuttke1, Steffen Sykora1, Rhea Kappenberger1, Saicharan Aswartham1, Sabine Wurmehl1, Bernd Büchner1,2,3, and Christian Hess1,3 — 1Leibniz Institute for Solid State and Materials Research, 01069 Dresden, Germany — 2Institut für Festkörperphysik, TU Dresden, 01069 Dresden — 3Center for Transport and Devices, TU Dresden, 01069 Dresden, Germany
The discovery of a divergent elasto-resistivity in iron-based superconductors promoted the nematicity to the class of the electronic orders together with superconductivity and density-waves, supporting the intriguing idea of an intimate link among all electronic instabilities. In this work we investigate the nematic phenomenology in different families of iron-based superconductors using a novel technique, which combines a state-of-art setup for Nernst effect measurements with a piezoelectric device for the application of uniaxial strain. By studying the temperature-dependence of the strain-derivative of the Nernst coefficient, we discovered that a Curie-Weiss-like fashion governs also the elasto-Nernst effect, as a fingerprint of strong nematic fluctuations. However, despite the universal diverging behavior, we show that elasto-Nernst and elasto-resistivity are not equivalently representative of the nematic susceptibility, offering a new insight into the nematic puzzle. Moreover, the emerging scenario provides an evidence of a band-dependent nematicity.