Strong Superexchange in a $d^{9-\delta }$ Nickelate Revealed by Resonant Inelastic X-Ray Scattering

J. Q. Lin, P. Villar Arribi, G. Fabbris +20

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…