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.
Strong Superexchange in a d9−δ Nickelate Revealed by Resonant Inelastic X-Ray Scattering / Lin, J. q., Villar Arribi, P., Fabbris, G., Botana, A. s., Meyers, D., Miao, H., Shen, Y., Mazzone, D. g., Feng, J., Chiuzbăian, S. g., Nag, A., Walters, A. c., García-Fernández, M., Zhou, K., Pelliciari, J., Jarrige, I., Freeland, J. w., Zhang, J., Mitchell, J. f., Bisogni, V., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 126:8(2021), pp. 1-5. [10.1103/physrevlett.126.087001]
Strong Superexchange in a d9−δ Nickelate Revealed by Resonant Inelastic X-Ray Scattering
Shen, Y.;Pelliciari, J.;
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.
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