Magnetic excitations in infinite-layer nickelates.
H LuMatteo RossiAbhishek NagMotoki OsadaDanfeng LiKyuho LeeBai Yang WangMirian Garcia-FernandezStefano AgrestiniZhi-Xun ShenEmily BeenBrian MoritzThomas Peter DevereauxJ ZaanenHarold Y HwangKe-Jin ZhouW S LeePublished in: Science (New York, N.Y.) (2021)
The discovery of superconductivity in infinite-layer nickelates brings us tantalizingly close to a material class that mirrors the cuprate superconductors. We measured the magnetic excitations in these nickelates using resonant inelastic x-ray scattering at the Ni L 3-edge. Undoped NdNiO2 possesses a branch of dispersive excitations with a bandwidth of approximately 200 milli-electron volts, which is reminiscent of the spin wave of strongly coupled, antiferromagnetically aligned spins on a square lattice. The substantial damping of these modes indicates the importance of coupling to rare-earth itinerant electrons. Upon doping, the spectral weight and energy decrease slightly, whereas the modes become overdamped. Our results highlight the role of Mottness in infinite-layer nickelates.
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