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. 2024 Aug 27;15:7387. doi: 10.1038/s41467-024-51479-3

Fig. 5. Characterization of NdxSr1−xNiO3 and non-superconducting NdxSr1−xNiO2 films.

Fig. 5

a XRD on Nd0.8Sr0.2NiO3 films grown by PLD, with and without a 10 nm SrTiO3 cap, showing a weak film (001) peak both before and after reduction, indicating a low-crystallinity as-grown film. Reduction further lowers crystallinity. b Atomic-resolution cross-sectional HAADF-STEM micrograph from the reduced SrTiO3/Nd0.8Sr0.2NiO2 film showing amorphous (marked as 1) and crystalline regions (marked as 2 and 3). The low-crystalline quality of the film after reduction is clearly visible and agrees with the XRD data. c SIMS depth profile of the as-grown Nd0.8Sr0.2NiO3 film indicates a separate surface layer. d SIMS depth profile of the reduced Nd0.8Sr0.2NiO2 film with a SrTiO3 cap, showing non-negligible but small hydrogen incorporation at the SrTiO3 cap/Nd0.8Sr0.2NiO2 interface.