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SKM 2023 – scientific programme

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DS: Fachverband Dünne Schichten

DS 12: Poster

DS 12.52: Poster

Wednesday, March 29, 2023, 17:00–19:00, P3

Contact printed micro circuit boards for thermoelectric circuits in van der Waals high temperature twisted cuprate heterostructures — •Sanaz Shokri1,2, Christian N Saggau1, Kornelius Nielsch1,2, and Nicola Poccia11Institute for Metallic Materials, IFW Dresden, Dresden,Germany, IFW Dresden — 2Institute for Materials Science, Dresden University of Technology

Recently, thermoelectric measurement has been established as an indicator of the topological nature of material due to its sensitivity to the Berry curvature. Nernst effect, which is defined as a generation of transverse electric field by a longitudinal temperature gradient in the presence of a magnetic field, in particular, is a powerful tool to investigate the area above superconductivity transition temperature where the transverse electrical signals become very small. Twisted Bi2Sr2CaCu2O8+δ (BSCCO) van der Waals heterostructures have exhibited topological superconductivity. Nevertheless, the BSCCO is too fragile to make a complex circuit like thermoelectric. Therefore, we developed the whole thermoelectric circuit like Seebeck and Nernst, embedded within inorganic SiN so called nanomembrane and transferred it on the optimally doped BSCCO flake inside the Ar-filled glovebox to encapsulate the BSCCO flakes and contact it at the same time. We used Pt as a heater and gold as the thermocouples and will calibrate our measurements based on the heat losses through a thermal insulating substrate and nanomembrane as well.

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