Extended Data Fig. 4: Statistics of Ni-O-Ni bond angles.
From: Interstitial oxygen order and its competition with superconductivity in La2PrNi2O7+δ
a, MEP-reconstructed image corresponding to AG in the pristine 327 phase. b, Color-coded map of the planar Ni-O-Ni bond angles of pristine 327 phase. Each square represents a planar oxygen, with its color indicating the deviation of the bond angle from 180°. Reddish squares (negative angles) correspond to planar oxygens distorted downward, while bluish squares (positive angles) indicate upward distortions. c, Statistical histogram of planar Ni-O-Ni bond angles for the pristine 327 phase, where the colors of individual components correspond to the respective components in panel b. The average bond angles and standard deviation is annotated within the panels. d, MEP-reconstructed image corresponding to HPO in the stage-1 period-b ordered phase. e, Color-coded map of bond angles for the stage-1 period-b ordered phase. Interstitial oxygens are represented as black circles. f, Statistical histogram of bond angles for the stage-1 period-b ordered phase, where the colors of individual components correspond to the respective components in panel e. g, MEP-reconstructed image corresponding to HPO in the stage-1 period-2b ordered phase. h, Color-coded map of bond angles for the stage-1 period-2b ordered phase. Interstitial oxygens are represented as black circles. i, Statistical histogram of bond angles for the stage-1 period-2b ordered phase, where the colors of individual components correspond to the respective components in panel h.
