Strong Superexchange in a d 9 − δ Nickelate Revealed by Resonant Inelastic X-Ray Scattering - Sorbonne Université Access content directly
Journal Articles Physical Review Letters Year : 2021

Strong Superexchange in a d 9 − δ Nickelate Revealed by Resonant Inelastic X-Ray Scattering

A. Nag
  • Function : Author
A. C. Walters
Ke-Jin Zhou
  • Function : Author
J. Pelliciari
Junjie Zhang
  • Function : Author

Abstract

The discovery of superconductivity in a $d^{9-{\delta}}$ nickelate has inspired disparate theoretical perspectives regarding the essential physics of this class of materials. A key issue is the magnitude of the magnetic superexchange, which relates to whether cuprate-like high-temperature nickelate superconductivity could be realized. We address this question using Ni L-edge and O K-edge spectroscopy of the reduced trilayer nickelate $d^{9-1/3}$ La4Ni3O8 and associated theoretical modeling. A magnon energy scale of ~80 meV resulting from a nearest-neighbor magnetic exchange of $J = 69(4)4$ meV is observed, proving that $d^{9-{\delta}}$ nickelates can host a large superexchange. This value, along with that of the Ni-O hybridization estimated from our O K-edge data, implies that trilayer nickelates represent an intermediate case between the infinite-layer nickelates and the cuprates, and suggests that they represent a promising route towards higher-temperature nickelate superconductivity.
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Dates and versions

hal-03952573 , version 1 (23-01-2023)

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J. Q. Lin, P. Villar Arribi, G. Fabbris, A. S. Botana, D. Meyers, et al.. Strong Superexchange in a d 9 − δ Nickelate Revealed by Resonant Inelastic X-Ray Scattering. Physical Review Letters, 2021, 126 (8), pp.087001. ⟨10.1103/PhysRevLett.126.087001⟩. ⟨hal-03952573⟩
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