Potential Lifshitz transition at optimal substitution in nematic pnictide Ba1−xSrxNi2As2

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Abstract

BaNi2As2 is a structural analog of the pnictide superconductor BaFe2As2, which, like the iron-based superconductors, hosts a variety of ordered phases including charge density waves (CDWs), electronic nematicity, and superconductivity. Upon isovalent Sr substitution on the Ba site, the charge and nematic orders are suppressed, followed by a sixfold enhancement of the superconducting transition temperature (Tc). To understand the mechanisms responsible for enhancement of Tc, we present high-resolution angle-resolved photoemission spectroscopy (ARPES) measurements of the Ba1−xSrxNi2As2 series, which agree well with our density functional theory (DFT) calculations throughout the substitution range. Analysis of our ARPES-validated DFT results indicates a Lifshitz transition and reasonably nested electron and hole Fermi pockets near optimal substitution where Tc is maximum. These nested pockets host Ni dxz/dyz orbital compositions, which we associate with the enhancement of nematic fluctuations, revealing unexpected connections to the iron-pnictide superconductors. This gives credence to a scenario in which nematic fluctuations drive an enhanced Tc

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Narayan, D. M., Hao, P., Kurleto, R., Berggren, B. S., Linn, A. G., Eckberg, C., … Dessau, D. S. (2023). Potential Lifshitz transition at optimal substitution in nematic pnictide Ba1−xSrxNi2As2. Science Advances, 9(42). https://doi.org/10.1126/SCIADV.ADI4966

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