Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 54: Fe-based Superconductors

TT 54.5: Vortrag

Donnerstag, 19. März 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 Hess1,31Leibniz 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.

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