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Absence of 3a0 charge density wave order in the infinite-layer nickelate NdNiO2

AuthorsParzyck, Christopher T.; Gupta, Naman K.; Wu, Y; Anil, V; Bhatt, L; Bouliane, M; Gong, R; Gregory, B Z; Luo, Aileen; Sutarto, Ronny; He, Feizhou; Chuang, Y-D; Zhou, T; Herranz, Gervasi CSIC ORCID; Kourkoutis, L F; Singer, Andrej; Schlom, Darrell G.; Hawthorn, David G.; Shen, Kyle M.
Issue Date26-Jan-2024
PublisherNature Publishing Group
CitationNature Materials: 10.1038/s41563-024-01797-0 (2024)
AbstractA hallmark of many unconventional superconductors is the presence of many-body interactions that give rise to broken-symmetry states intertwined with superconductivity. Recent resonant soft X-ray scattering experiments report commensurate 3a0 charge density wave order in infinite-layer nickelates, which has important implications regarding the universal interplay between charge order and superconductivity in both cuprates and nickelates. Here we present X-ray scattering and spectroscopy measurements on a series of NdNiO2+x samples, which reveal that the signatures of charge density wave order are absent in fully reduced, single-phase NdNiO2. The 3a0 superlattice peak instead originates from a partially reduced impurity phase where excess apical oxygens form ordered rows with three-unit-cell periodicity. The absence of any observable charge density wave order in NdNiO2 highlights a crucial difference between the phase diagrams of cuprate and nickelate superconductors.
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