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I05-ARPES	Potential Lifshitz transition at optimal substitution in nematic pnictide Ba1−xSrxNi2As2 Dushyant Narayan , Peipei Hao , Rafal Kurleto , Bryan S. Berggren , A. Garrison Linn , Christopher Eckberg , Prathum Saraf , John Collini , Peter Zavalij , Makoto Hashimoto , Donghui Lu , Rafael M. Fernandes , Johnpierre Paglione , Daniel S. Dessau Science Advances 9 DOI: 10.1126/sciadv.adi4966 Diamond Proposal Number(s): [25827] Open Access Show Abstract ▼ 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.	Oct 2023

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I05-ARPES

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