Strong Superexchange in a $d^{9-{\delta}}$ Nickelate Revealed by Resonant Inelastic X-Ray Scattering
| Autor: | Lin, J. Q., Arribi, P. Villar, Fabbris, G., Botana, A. S., Meyers, D., Miao, H., Shen, Y., Mazzone, D. G., Feng, J., Chiuzbaian, S. G., Nag, A., Walters, A. C., Garcia-Fernandez, M., Zhou, Ke-Jin, Pelliciari, J., Jarrige, I., Freeland, J. W., Zhang, Junjie, Mitchell, J. F., Bisogni, V., Liu, X., Norman, M. R., Dean, M. P. M. |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Phys. Rev. Lett. 126, 087001 (2021) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevLett.126.087001 |
| Popis: | 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. Comment: 7 pages not including supplmentary material; To appear in Physical Review Letters |
| Databáze: | arXiv |
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