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Charge Distribution across Capped and Uncapped Infinite-Layer Neodymium Nickelate Thin Films
Aravind Raji1,2, Guillaume Krieger3, Nathalie Viart3
1Laboratoire de Physique des Solides, CNRS, Université Paris-Saclay, Orsay, 91405, France.
Charge ordering in NdNiO2 thin films was investigated. Capped films show stabilized infinite-layer structures, while uncapped films exhibit charge ordering linked to oxygen re-intercalation and hole doping.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Solid-State Chemistry
Background:
- Charge ordering (CO) is a key phenomenon in strongly-correlated electron systems.
- Understanding CO's role in high-temperature superconductivity is crucial.
- NdNiO2 thin films are a relevant system for studying these phenomena.
Purpose of the Study:
- To elucidate the structural and charge distribution in NdNiO2 thin films.
- To compare films with and without capping layers to understand CO presence/absence.
- To investigate the link between structural changes, oxygen, and CO.
Main Methods:
- Scanning transmission electron microscopy-electron energy loss spectroscopy (STEM-EELS).
- Hard X-ray photoemission spectroscopy (HAXPES).
- 4D-STEM analysis.
Main Results:
- Capped NdNiO2 films show Ni(1+) and a stabilized out-of-plane lattice parameter (~3.30 Å).
- Uncapped films exhibit increased out-of-plane lattice parameter (~3.65 Å) and Ni valence towards Ni(2+).
- 4D-STEM revealed (303)-oriented stripes in uncapped films, linked to oxygen re-intercalation and hole doping.
Conclusions:
- Capping layers stabilize the infinite-layer structure in NdNiO2 films.
- Oxygen re-intercalation and hole doping in uncapped films are associated with charge ordering.
- These findings suggest a potential link between structural modulations and CO in infinite-layer nickelates.
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