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Universal orbital and magnetic structures in infinite-layer nickelates

DOI: 10.1103/PhysRevB.109.024512 DOI Help

Authors: M. Rossi (SLAC National Accelerator Laboratory) , H. Lu (SLAC National Accelerator Laboratory; Stanford University) , K. Lee (SLAC National Accelerator Laboratory; Stanford University) , B. H. Goodge (Cornell University) , J. Choi (Diamond Light Source) , M. Osada (SLAC National Accelerator Laborator; Stanford University) , Y. Lee (Stanford University) , D. Li (SLAC National Accelerator Laboratory; Stanford University) , B. Y. Wang (SLAC National Accelerator Laboratory; Stanford University) , D. Jost (SLAC National Accelerator Laboratory) , S. Agrestini (Diamond Light Source) , M. Garcia-Fernandez (Diamond Light Source) , Z. X. Shen (SLAC National Accelerator Laboratory; Stanford University) , Ke-Jin Zhou (Diamond Light Source; Stanford University) , E. Been (Stanford University) , B. Moritz (SLAC National Accelerator Laboratory) , L. F. Kourkoutis (Cornell University) , T. P. Devereaux (SLAC National Accelerator Laboratory; Stanford University) , H. Y. Hwang (SLAC National Accelerator Laboratory; Stanford University) , W. S. Lee (SLAC National Accelerator Laboratory)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 109

State: Published (Approved)
Published: January 2024
Diamond Proposal Number(s): 25598

Abstract: We conducted a comparative study of the rare-earth infinite-layer nickelate films, R NiO 2 ( R = La, Pr, and Nd), using resonant inelastic x-ray scattering (RIXS). We found that the gross features of the orbital configurations are essentially the same, with minor variations in the detailed hybridization. For low-energy excitations, we unambiguously confirm the presence of damped magnetic excitations in all three compounds. By fitting to a linear spin-wave theory, comparable spin exchange coupling strengths and damping coefficients are extracted, indicating a universal magnetic structure in the infinite-layer nickelates. Interestingly, while signatures of a charge order are observed in LaNiO 2 in the quasielastic region of the RIXS spectrum, it is absent in NdNiO 2 and PrNiO 2 . This prompts further investigation into the universality and the origins of charge order within the infinite-layer nickelates.

Journal Keywords: Charge order; Electronic structure; Magnons; Superconductivity; Nickelates; Resonant inelastic x-ray scattering

Subject Areas: Materials, Physics


Instruments: I21-Resonant Inelastic X-ray Scattering (RIXS)

Added On: 25/01/2024 10:08

Discipline Tags:

Surfaces Superconductors Quantum Materials Physics Hard condensed matter - structures Magnetism Materials Science interfaces and thin films

Technical Tags:

Scattering Resonant Inelastic X-ray Scattering (RIXS)