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Comment on newly found Charge Density Waves in infinite layer Nickelates

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arxiv 2306.15086 v1 pith:CL6HWHP6 submitted 2023-06-26 cond-mat.supr-con cond-mat.mtrl-scicond-mat.othercond-mat.str-el

J. Pelliciari , N. Khan , P. Wasik , A. Barbour , Y.Li , Y. Nie , J. M. Tranquada , V. Bisogni
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C. Mazzoli
This is my paper · ORCID
classification cond-mat.supr-concond-mat.mtrl-scicond-mat.othercond-mat.str-el
keywords anglechargedensitydiffractionfixedfoundinfinitelayer
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abstract

Recent works[1-3] reported evidence for charge density waves (CDWs) in infinite layer nickelates (112 structure) based on resonant diffraction at the Ni $L_3$ edge measured at fixed scattering angle. We have found that a measurement with fixed momentum transfer, rather than scattering angle, does not show a resonance effect. We have also observed that a nearby structural Bragg peak from the substrate appears due to third harmonic content of the incident beam, and spreads intensity down to the region of the attributed CDW order. This was further confirmed by testing a bare substrate. We suggest procedures to confirm an effective resonant enhancement of a diffraction peak.

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  1. Oxygen sublattice disorder and valence state modulation in infinite-layer nickelate superlattices

    cond-mat.supr-con 2025-02 conditional novelty 6.0 of 10

    Resonant x-ray reflectivity reveals that oxygen vacancies are distributed unevenly in reduced nickelate superlattices, with more disorder and lower conductivity when the spacer is LaGaO3 rather than SrTiO3.

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