Magnetic excitations in infinite-layer nickelates

Abstract

The discovery of superconductivity in infinite-layer nickelates brings us tantalizingly close to a new material class that mirrors the cuprate superconductors. Here, we report on magnetic excitations in these nickelates, measured using resonant inelastic x-ray scattering (RIXS) at the Ni L3-edge, to shed light on the material complexity and microscopic physics. Undoped NdNiO2 possesses a branch of dispersive excitations with a bandwidth of approximately 200 meV, reminiscent of strongly-coupled, antiferromagnetically aligned spins on a square lattice, despite a lack of evidence for long range magnetic order. The significant damping of these modes indicates the importance of coupling to rare-earth itinerant electrons. Upon doping, the spectral weight and energy decrease slightly, while the modes become overdamped. Our results highlight the role of Mottness in infinite-layer nickelates.

arXiv commentThis is the initially submitted version before revising for reviewers' comments. The peer-reviewed version has been accepted at Science and will be published soon

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• Unusual Hole-doping-dependent Electronic Instability and Electron-Phonon Coupling in Infinite-layer Nickelates
• Possible structural quantum criticality tuned by rare-earth ion substitution in infinite-layer nickelates
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• Magnetic excitations in infinite-layer nickelates
• Hot-lines topology and the fate of the spin resonance mode in three-dimensional unconventional superconductors