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

1 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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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.}",

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year = "2023",

doi = "10.1126/SCIADV.ADI4966",

language = "English (US)",

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

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