Potential Lifshitz transition at optimal substitution in nematic pnictide Ba 1− x Sr x Ni 2 As 2

Author:

Narayan Dushyant M.1ORCID,Hao Peipei1ORCID,Kurleto Rafał1ORCID,Berggren Bryan S.1ORCID,Linn A. Garrison1ORCID,Eckberg Christopher2ORCID,Saraf Prathum2,Collini John2,Zavalij Peter3ORCID,Hashimoto Makoto4ORCID,Lu Donghui4ORCID,Fernandes Rafael M.5ORCID,Paglione Johnpierre26ORCID,Dessau Daniel S.1ORCID

Affiliation:

1. Center for Experiments on Quantum Materials, Department of Physics, University of Colorado, Boulder, CO 80309, USA.

2. Maryland Quantum Materials Center, Department of Physics, University of Maryland, College Park, MD 20742, USA.

3. Department of Chemistry, University of Maryland, College Park, MD 20742, USA.

4. Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA.

5. School of Physics and Astronomy, University of Minnesota, Minneapolis, MN 55455, USA.

6. Canadian Institute for Advanced Research, Toronto, ON M5G-1Z8, Canada.

Abstract

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

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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