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Strong Superexchange in a d9-δ Nickelate Revealed by Resonant Inelastic X-Ray Scattering.
- Source :
-
Physical Review Letters . 2/26/2021, Vol. 126 Issue 8, p1-1. 1p. - Publication Year :
- 2021
-
Abstract
- The discovery of superconductivity in a d9-δ 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 d9-1/3 trilayer nickelates R4Ni3O8 (where R=La, Pr) and associated theoretical modeling. A magnon energy scale of ∼80 meV resulting from a nearest-neighbor magnetic exchange of J=69(4) meV is observed, proving that d9-δ 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. [ABSTRACT FROM AUTHOR]
- Subjects :
- *INELASTIC scattering
*X-ray scattering
*MAGNONS
*SUPERCONDUCTIVITY
*CUPRATES
Subjects
Details
- Language :
- English
- ISSN :
- 00319007
- Volume :
- 126
- Issue :
- 8
- Database :
- Academic Search Index
- Journal :
- Physical Review Letters
- Publication Type :
- Academic Journal
- Accession number :
- 149099309
- Full Text :
- https://doi.org/10.1103/PhysRevLett.126.087001