Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 20: Focus Session: The Nickel Age of Superconductivity: Cuprates Reloaded or Something New?

TT 20.5: Hauptvortrag

Dienstag, 17. März 2020, 11:45–12:15, HSZ 03

Doping infinite-layer nickelates: A superlattice approach — •Eva Benckiser — Max Planck Institute for Solid State Research, Stuttgart, Germany

Recently, the observation of superconductivity in strontium-doped NdNiO₂ thin films has attracted a lot of attention [1]. We have been working on a different approach to dope the infinite-layer nickelates, where we considered layer-selective, topotactically reduced rare-earth nickelate layer stacks in a superlattice structure with the aim to control the doping level by the stack thickness. In my talk I will present our results from x-ray spectroscopy together with ab-initio calculations of the layer-resolved, local nickel electronic configuration in these artificial superlattices and discuss similarities and differences to the electronic structure of copper in high-temperature superconductors.

[1] D. Li, K. Lee, B. Y. Wang, M. Osada, S. Crossley, H. R. Lee, Y. Cui, Y. Hikita, and H. Y. Hwang, Nature 572 (2019) 624