Extended Data Fig. 2: Elemental EELS mapping for Pr dopant distribution.
From: Interstitial oxygen order and its competition with superconductivity in La2PrNi2O7+δ
a-b, Simultaneously acquired HAADF image (left panel), Pr M5-edge intensity map (middle panel), and La M5-edge intensity map (right panel) for as-grown La2.7Pr0.3Ni2O7 (Pr0.3-AG, panel a) and another sample region from as-grown La2PrNi2O7 (Pr1-AG, panel b). Both regions exhibit the same preference for Pr dopants to substitute La atoms in the outer rock-salt LaO layer.
