Title: Potential Lifshitz transition at optimal substitution in nematic pnictide Ba1xSrxNi2As2

Journal Article · · Science Advances
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [3];  [3];  [3]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [6]; ORCiD logo [2]
  1. University of Colorado, Boulder, CO (United States); SLAC
  2. University of Colorado, Boulder, CO (United States)
  3. University of Maryland, College Park, MD (United States)
  4. SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
  5. University of Minnesota, Minneapolis, MN (United States)
  6. University of Maryland, College Park, MD (United States); Canadian Institute for Advanced Research, Toronto (Canada)
+ Show Author Affiliations

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.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); University of Minnesota, Minneapolis, MN (United States)
Sponsoring Organization:
Gordon and Betty Moore Foundation; National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)
Grant/Contract Number:
AC02-05CH11231; AC02-76SF00515; FG02-03ER46066; SC0020045
OSTI ID:
2281585
Journal Information:
Science Advances, Journal Name: Science Advances Journal Issue: 42 Vol. 9; ISSN 2375-2548
Publisher:
AAASCopyright Statement
Country of Publication:
United States
Language:
English

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