Substrate and cation engineering for optimizing superconductivity in infinite-layer nickelates

ORAL

Abstract

In a  recent experiment [Nature 642, 58 (2025)], a new record for the superconducting critical temperature (Tc) among infinite-layer nickelates has been reported in doped SmNiO2. Here, we use cutting-edge dynamical vertex approximation (DΓA), and qualitatively as well as quantitatively reproduce the Tc vs. doping dome for this compound. Encouraged by this, we go further and identify a path towards realizing even higher Tc's by changing the cation along the line Nd→Sm→Y→Lu with matching substrates. The successively smaller cation radius allows for smaller lattice constants of the substrate. This increases the hopping-to-interaction ratio and thus  Tc.

We acknowledge support from the Austrian Science Fund (FWF), Project I 5398.

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Presenters

  • Viktor Christiansson

    • TU Wien

Authors

  • Viktor Christiansson

    • TU Wien

  • Karsten Held

    • TU Wien
    • Technical University of Vienna