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I21-Resonant Inelastic X-ray Scattering (RIXS)	A broken translational symmetry state in an infinite-layer nickelate Matteo Rossi , Motoki Osada , Jaewon Choi , Stefano Agrestini , Daniel Jost , Yonghun Lee , Haiyu Lu , Bai Yang Wang , Kyuho Lee , Abhishek Nag , Yi-De Chuang , Cheng-Tai Kuo , Sang-Jun Lee , Brian Moritz , Thomas P. Devereaux , Zhi-Xun Shen , Jun-Sik Lee , Ke-Jin Zhou , Harold Y. Hwang , Wei-Sheng Lee Nature Physics 309 DOI: 10.1038/s41567-022-01660-6 Diamond Proposal Number(s): [25598, 27558] Show Abstract ▼ Abstract: A defining signature of strongly correlated electronic systems is a rich phase diagram, which consists of multiple broken symmetries, such as magnetism, superconductivity and charge order1,2. In the recently discovered nickelate superconductors3,4,5,6,7,8,9,10, a large antiferromagnetic exchange energy has been reported, which implies the existence of strong electronic correlations11. However, signatures of a broken-symmetry state other than superconductivity have not yet been observed. Here we observe charge ordering in infinite-layer nickelates La1−xSrxNiO2 using resonant X-ray scattering. The parent compound orders along the Ni–O bond direction with an incommensurate wavevector, distinct from the stripe order observed in other nickelates12,13,14 that propagates along a direction 45° to the Ni–O bond. The resonance profile we measure indicates that ordering originates from the nickelate layers and induces a parasitic charge modulation of lanthanum electrons. Upon doping, the charge order diminishes and its wavevector shifts towards commensurate, hinting that strong electronic correlations are likely to be responsible for the ordered state. Our results suggest that the existence of charge order and its potential interplay with antiferromagnetic fluctuations and superconductivity are important themes in nickel-based superconductors.	Jul 2022

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I21-Resonant Inelastic X-ray Scattering (RIXS)

A broken translational symmetry state in an infinite-layer nickelate