The normal-state transport properties of superconducting infinite-layer nickelates are investigated within an interacting three-orbital model. It includes effective Ni-dz2, Ni-dx2−y2 bands as well as the self-doping band degree of freedom. Thermopower, Hall coefficient and optical conductivity are modelled within a quasiparticle approximation to the electronic states. Qualitative agreement in comparison to experimentally available Hall data is achieved, with notably a temperature-dependent sign change of the Hall coefficient for larger hole doping x. The Seebeck coefficient changes from negative to positive in a non-trivial way with x, but generally shows only modest temperature dependence. The optical conductivity shows a pronounced Drude response and a prominent peak structure at higher frequencies due to interband transitions. While the quasiparticle picture is surely approximative to low-valence nickelates, it provides enlightening insights into the multiorbital nature of these challenging systems.
@article{arxiv.2303.05926,
title = {Quasiparticle approach to the transport in infinite-layer nickelates},
author = {Steffen Bötzel and Ilya M. Eremin and Frank Lechermann},
journal= {arXiv preprint arXiv:2303.05926},
year = {2023}
}