Potential Lifshitz transition at optimal substitution in nematic pnictide Ba1xSrxNi2As2

Narayan, Dushyant M.; Hao, Peipei; Kurleto, Rafał; Berggren, Bryan S.; Linn, A. Garrison; Eckberg, Christopher; Saraf, Prathum; Collini, John; Zavalij, Peter; Hashimoto, Makoto; Lu, Donghui; Fernandes, Rafael M.; Paglione, Johnpierre; Dessau, Daniel S.

doi:10.1126/sciadv.adi4966

Title: Potential Lifshitz transition at optimal substitution in nematic pnictide Ba_1xSr_xNi₂As₂

Journal Article · Wed Oct 18 00:00:00 EDT 2023 · Science Advances

DOI:https://doi.org/10.1126/sciadv.adi4966· OSTI ID:2281585

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University of Colorado, Boulder, CO (United States)
University of Maryland, College Park, MD (United States)
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
University of Minnesota, Minneapolis, MN (United States)
University of Maryland, College Park, MD (United States); Canadian Institute for Advanced Research, Toronto (Canada)

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 (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-xSr_xNi₂As₂ 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.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); Gordon and Betty Moore Foundation; National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: AC02-76SF00515; FG02-03ER46066; GBMF9458; AC02-05CH11231; DMR1905891; GBMF9071; SC0020045; ACI-1532235; ACI-1532236

OSTI ID:: 2281585

Journal Information:: Science Advances, Vol. 9, Issue 42; ISSN 2375-2548

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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