Fig. 2: Atomic structure of the stripe domains in Nd0.8Sr0.2NiO2.
From: Atomic scale disorder and reconstruction in bulk infinite-layer nickelates lacking superconductivity
a Atom model of layered T′-type (Nd0.8Sr0.2)4Ni3O8 (n = 3). b Atomic-resolved iDPC-STEM image of the T′-type phase along [100] direction with the light elements in infinite and fluorite layers clearly resolved. The atomic model is overlaid to guide the eyes. c Atomic-resolved HAADF-STEM image of the stripes under [100] orientation, and the atomic models without oxygen are overlaid accordingly. To differentiate between T′-type phase and infinite layer structures, the latter are simply defined here as n > 10 layers. d The intensity profile across adjacent Nd atomic columns is extracted along the direction indicated by the green arrow in (c). The orange arrows are used to mark the fluorite layers. e Averaged bond lengths between R-site atoms along [001] direction. f Strain εyy along the [001] calculated by GPA for (c).
