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

Dushyant M. 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

doi:10.1126/SCIADV.ADI4966

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

Dushyant M. 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

Physics and Astronomy (Twin Cities)

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

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 (T_c). To understand the mechanisms responsible for enhancement of T_c, we present high-resolution angle-resolved photoemission spectroscopy (ARPES) measurements of the Ba₁₋_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.

Original language	English (US)
Article number	eadi4966
Journal	Science Advances
Volume	9
Issue number	42
DOIs	https://doi.org/10.1126/SCIADV.ADI4966
State	Published - 2023

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© 2023 The Authors.

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Narayan, D. M., Hao, P., Kurleto, R., Berggren, B. S., Linn, A. G., Eckberg, C., Saraf, P., Collini, J., Zavalij, P., Hashimoto, M., Lu, D., Fernandes, R. M., Paglione, J., & Dessau, D. S. (2023). Potential Lifshitz transition at optimal substitution in nematic pnictide Ba1−xSrxNi2As2. Science Advances, 9(42), Article eadi4966. https://doi.org/10.1126/SCIADV.ADI4966

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title = "Potential Lifshitz transition at optimal substitution in nematic pnictide Ba1−xSrxNi2As2",

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.",

author = "Narayan, \{Dushyant M.\} and Peipei Hao and Rafal Kurleto and Berggren, \{Bryan S.\} and Linn, \{A. Garrison\} and Christopher Eckberg and Prathum Saraf and John Collini and Peter Zavalij and Makoto Hashimoto and Donghui Lu and Fernandes, \{Rafael M.\} and Johnpierre Paglione and Dessau, \{Daniel S.\}",

note = "Publisher Copyright: {\textcopyright} 2023 The Authors.",

year = "2023",

doi = "10.1126/SCIADV.ADI4966",

language = "English (US)",

volume = "9",

journal = "Science Advances",

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T1 - Potential Lifshitz transition at optimal substitution in nematic pnictide Ba1−xSrxNi2As2

AU - Narayan, Dushyant M.

AU - Hao, Peipei

AU - Kurleto, Rafal

AU - Berggren, Bryan S.

AU - Linn, A. Garrison

AU - Eckberg, Christopher

AU - Saraf, Prathum

AU - Collini, John

AU - Zavalij, Peter

AU - Hashimoto, Makoto

AU - Lu, Donghui

AU - Fernandes, Rafael M.

AU - Paglione, Johnpierre

AU - Dessau, Daniel S.

PY - 2023

Y1 - 2023

N2 - 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.

AB - 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.

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DO - 10.1126/SCIADV.ADI4966

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AN - SCOPUS:85174748430

SN - 2375-2548

VL - 9

JO - Science Advances

JF - Science Advances

IS - 42

M1 - eadi4966

ER -

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

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