Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 16: Poster Session Superconductivity, Cryogenic Particle Detectors, Cryotechnique

TT 16.8: Poster

Montag, 16. März 2020, 15:00–19:00, P2/EG

Nernst Effect and Thermal Conductivity in Nd doped La_1.81Sr_0.19 CuO₄ — •Sanaz Shokri¹, Christoph Wuttke¹, Federico Caglieris¹, Koushik Karmakar¹, Andrey Malyuk¹, Silvia Seiro¹, Christian Heß^1,2, and Bernd Büchner^1,2,3 — ¹IFW , Dresden, Germany — ²Centre for Transport and Devices, TU dresden, Germany — ³Institut für Festkörper Physik, TU Dresden, Germany

The interrelation of superconductivity, stripe correlations, and pseudogap in cuprate superconductors is an unresolved issue for rationalizing the physics of these materials. Here we focus on the thermal conductivity κ and the Nernst coefficient ν of La_2−y−xNd_ySr_xCuO₄ at x=0.19, which is a prototype cuprate superconductor with a hole concentration close to p ≈ 0.18, below which pseudogap are considered to emerge in various physical properties [1]. Additionally, the Nd doping is understood to play an essential role for the appearance of stripe correlations [2]. Our data reveal a striking non-monotonic evolution of both ν and κ as a function of y. The data will be discussed in terms of the impact of Nd-doping on the buckling of the CuO₂ planes.

[1] O. Cyr-Choiniere et al., PRL 97, 064502(2017)

[2] J. Tranquada et al., Nature, 375, 561 (1994)