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Superconducting nickelates are a new family of materials that combinestrongly-correlated magnetism with unconventional superconductivity. Whilecomparisons with the superconducting cuprates are natural, very little is knownabout the metallic state of the nickelates, making these comparisons difficult.We probe the electronic dispersion of thin-film superconducting 5-layer ($n=5$)and metallic 3-layer ($n=3$) nickelates by measuring the Seebeck coefficient,$S$. We find a temperature independent and negative $S/T$ for both the $n=5$nickelate, with strange metal resistivity, and the $n=3$ compound, with moreconventional Fermi liquid resistivity. These results are in stark contrast withthe strongly temperature-dependent $S/T$ measured at similar electron fillingin the cuprate La$_{1.36}$Nd$_{0.4}$Sr$_{0.24}$CuO$_4$. We reproduce thetemperature dependence, sign, and amplitude of $S/T$ in the nickelates usingBoltzmann transport theory combined with the electronic structure calculatedfrom density functional theory. This demonstrates that the electronic structureobtained from first-principles calculations is a good starting point forcalculating the transport properties of superconducting nickelates, andsuggests that, despite indications of strong electronic correlations, there arewell-defined quasiparticles in the metallic state of this family of materials.Finally, we explain the differences in the Seebeck coefficient betweennickelates and cuprates as originating in strong dissimilarities in impurityconcentrations. Beyond establishing a baseline understanding of how theelectronic structure relates to transport coefficients in these new materials,this work demonstrates the power of the semi-classical approach toquantitatively describe transport measurements, even in the strange-metallicstate.

Seebeck coefficient in a nickelate superconductor: electronic dispersion in the strange metal phase