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<p>Infinite-layer nickelates are among the most promising cuprate-akin superconductors, although relevant differences from copper oxides have been reported. Here, we present momentum- and polarization-resolved RIXS measurements on nominally undoped, superconducting PrNiO<sub>2</sub>, and compare its magnetic and orbital excitations with those of the reference infinite layer cuprate CaCuO<sub>2</sub>. In PrNiO<sub>2</sub>, the in-plane magnetic exchange integrals are smaller than in CaCuO<sub>2</sub>, whereas the out-of-plane values are similar, indicating that both materials support three-dimensional antiferromagnetic correlations. Orbital excitations, associated to the transitions within 3<i>d</i> states of the metal, are well reproduced within a single-ion model and display similar characteristics, except the Ni-<i>d</i><sub><i>x</i><i>y</i></sub> peak that, besides lying at significantly lower energy, shows an opposite dispersion to that of Cu-<i>d</i><sub><i>x</i><i>y</i></sub>. We attribute this difference to the values of the orbital superexchange coupling between nearest neighbor sites. Our observations suggest that infinite-layer cuprates and nickelates share most of the spin and orbital properties, but in nickelates the larger charge-transfer energy Δ and smaller hopping integrals imply smaller spin-fluctuation energy and stronger localization of the doping charge on the metal site. <a href="https://doi.org/10.15151/ESRF-ES-1430231833">https://doi.org/10.15151/ESRF-ES-1430231833</a>.</p>

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Spin and orbital excitations in undoped infinite-layer superconducting PrNiO2 and insulating CaCuO2

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月21日

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  • F. Rosa,
  • H. Sahib,
  • G. Merzoni,
  • L. Martinelli,
  • R. Arpaia,
  • N. B. Brookes,
  • D. Di Castro,
  • K. Wohlfeld,
  • M. Zinouyeva,
  • M. Salluzzo,
  • D. Preziosi,
  • G. Ghiringhelli

摘要

Infinite-layer nickelates are among the most promising cuprate-akin superconductors, although relevant differences from copper oxides have been reported. Here, we present momentum- and polarization-resolved RIXS measurements on nominally undoped, superconducting PrNiO2, and compare its magnetic and orbital excitations with those of the reference infinite layer cuprate CaCuO2. In PrNiO2, the in-plane magnetic exchange integrals are smaller than in CaCuO2, whereas the out-of-plane values are similar, indicating that both materials support three-dimensional antiferromagnetic correlations. Orbital excitations, associated to the transitions within 3d states of the metal, are well reproduced within a single-ion model and display similar characteristics, except the Ni-dxy peak that, besides lying at significantly lower energy, shows an opposite dispersion to that of Cu-dxy. We attribute this difference to the values of the orbital superexchange coupling between nearest neighbor sites. Our observations suggest that infinite-layer cuprates and nickelates share most of the spin and orbital properties, but in nickelates the larger charge-transfer energy Δ and smaller hopping integrals imply smaller spin-fluctuation energy and stronger localization of the doping charge on the metal site. https://doi.org/10.15151/ESRF-ES-1430231833.