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Potential Lifshitz transition at optimal substitution in nematic pnictide Ba\\(_{1-x}\\)Sr\\(_x\\)Ni\\(_2\\)As\\(_2\\)
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Potential Lifshitz transition at optimal substitution in nematic pnictide Ba\\(_{1-x}\\)Sr\\(_x\\)Ni\\(_2\\)As\\(_2\\)
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Potential Lifshitz transition at optimal substitution in nematic pnictide Ba\\(_{1-x}\\)Sr\\(_x\\)Ni\\(_2\\)As\\(_2\\)
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Paper
Potential Lifshitz transition at optimal substitution in nematic pnictide Ba\\(_{1-x}\\)Sr\\(_x\\)Ni\\(_2\\)As\\(_2\\)
2023
Overview
BaNi\\(_2\\)As\\(_2\\) is a structural analog of the pnictide superconductor BaFe\\(_2\\)As\\(_2\\), 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 (\\(T_c\\)). To understand the mechanisms responsible for enhancement of \\(T_c\\), we present high-resolution angle-resolved photoemission spectroscopy (ARPES) measurements of the Ba\\(_{1-x}\\)Sr\\(_{x}\\)Ni\\(_2\\)As\\(_2\\) 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 \\(T_c\\) is maximum. These nested pockets host Ni \\(d_{xz}\\)/\\(d_{yz}\\) 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 \\(T_c\\).
Publisher
Cornell University Library, arXiv.org
