SKM 2023 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 50: Focus Session: Superconducting Nickelates II

TT 50.7: Talk

Thursday, March 30, 2023, 16:30–16:45, HSZ 03

Transport properties of Nd_1−xSr_xNiO₂ based on a realistic 3-band model — •Steffen Bötzel, Ilya Eremin, and Frank Lechermann — Institut für theoretische Physik III, Ruhr-Universität Bochum, Bochum, Germany

Here, we consider theoretically the quasiparticle transport in the superconducting nickelate Nd_1−xSr_xNiO₂ based on a realistic 3-band low-energy model derived from a first-principle approach [1]. The transport properties are obtained from the standard Kubo formalism. They depend on the band structure near the Fermi surface and are consequently a probe of the hitherto poorly understood low-energy electronic structure. We find significant contributions from different orbitals and bands depending on temperature and doping. Their interplay gives rise to multi-band characteristics, which are in accordance to available experimental data. This observation is important for the ongoing debate whether the low-energy physics is single- or multi-band like and points towards multi-band physics in these compounds.
[1] F. Lechermann, Phys. Rev. X. 10, 041002 (2020)