4.8 Article

Strong Superexchange in a d9-δ Nickelate Revealed by Resonant Inelastic X-Ray Scattering

Journal

PHYSICAL REVIEW LETTERS
Volume 126, Issue 8, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.126.087001

Keywords

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Funding

  1. U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0012704]
  2. US Department of Energy, Office of Science, Basic Energy Sciences, Materials Science and Engineering Division
  3. US Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
  4. ShanghaiTech University startup fund
  5. MOST of China [2016YFA0401000]
  6. NSFC [11934017]
  7. Chinese Academy of Sciences [112111KYSB 20170059]
  8. NSF DMR [2045826]
  9. ASU Research Computing Center for HPC
  10. DOE Office of Science by Brookhaven National Laboratory [DE-SC0012704]
  11. Division Of Materials Research
  12. Direct For Mathematical & Physical Scien [2045826] Funding Source: National Science Foundation

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The discovery that d(9-delta) nickelates can host a large superexchange has sparked diverse theoretical perspectives on the fundamental physics of this class of materials. The findings suggest that layered nickelates could represent an intermediate case between infinite-layer nickelates and cuprates, providing a pathway for testing the relevance of superexchange to nickelate superconductivity.
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 d(9-1/3) trilayer nickelates R4Ni3O8 (where R = La, Pr) and associated theoretical modeling. A magnon energy scale of similar to 80 meV resulting from a nearest-neighbor magnetic exchange of J = 69(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. Layered nickelates thus provide a route to testing the relevance of superexchange to nickelate superconductivity.

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