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Charge density waves in infinite-layer NdNiO2 nickelates
Charles C Tam1,2, Jaewon Choi1, Xiang Ding3
1Diamond Light Source, Didcot, United Kingdom.
Nature Materials
|August 18, 2022
Summary
Charge density waves (CDWs) were observed in infinite-layer NdNiO2 films, distinct from cuprates. These CDWs disappear upon achieving superconductivity, offering new insights into nickelate physics.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Solid State Chemistry
Background:
- Superconductivity research aims to replicate cuprate behavior in new materials.
- Infinite-layer nickelates have emerged as a promising class of superconductors.
- Strong Coulomb interactions in nickelates suggest potential for symmetry-breaking orders.
Purpose of the Study:
- To investigate the presence and characteristics of charge density waves (CDWs) in infinite-layer nickelates.
- To understand the relationship between CDWs, orbital hybridization, and superconductivity in NdNiO2 films.
Main Methods:
- Utilized Ni L3 resonant X-ray scattering to detect CDWs.
- Employed spectroscopic studies to analyze orbital hybridization.
- Investigated doped NdNiO2 films with varying Sr concentrations.
Main Results:
- Observed CDWs in infinite-layer NdNiO2 films at a commensurate wavevector (0.333, 0).
- CDWs were found to involve both Nd 5d and Ni 3d orbitals with significant out-of-plane dependence.
- A strong correlation was identified between CDWs and Nd 5d-Ni 3d orbital hybridization.
- CDWs vanished upon entering the superconducting state at 20% Sr doping.
Conclusions:
- Demonstrated the existence of multiorbital CDWs in infinite-layer nickelates, differing from cuprates.
- Established a link between CDWs, orbital hybridization, and the emergence of superconductivity.
- Provided crucial insights into the low-energy physics of infinite-layer nickelates.
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