Optimization of unconventional superconductivity requires precise determination of correlation strengths across material families. Here, the authors use X-ray absorption spectroscopy and resonant inelastic X-ray scattering to reveal that PrNiO2 exhibits a 20% stronger correlation strength U/t than in the isostructural cuprate SrCuO2, suggesting potential for enhanced superconductivity in nickelates through correlation strength moderation.
- Xunyang Hong
- Yuetong Wu
- Johan Chang