학술논문
Strong Superexchange in a $d^{9-{\delta}}$ Nickelate Revealed by Resonant Inelastic X-Ray Scattering
Document Type
Working Paper
Author
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.
Source
Phys. Rev. Lett. 126, 087001 (2021)
Subject
Language
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.
Comment: 7 pages not including supplmentary material; To appear in Physical Review Letters
Comment: 7 pages not including supplmentary material; To appear in Physical Review Letters