Fig. 3: First-principles calcualtions on the lattice-mediated valence change in RP nicklates.
From: Strain-mediated phase crossover in Ruddlesden–Popper nickelates
Correlation between in-plane lattices and the valence state of Ni ions in a LaNiO3 and b La3Ni2O7, where the vertical lines in a, b indicate the nominal valence state of Ni ions in LaNiO3 (Ni3+) and La3Ni2O7 (Ni2.5+), respectively.
