Fig. 5: Structural comparison between pristine La3Ni2O7 and La3Ni2O7−δ, projected along the [110] axis.
From: Impact of pressure and apical oxygen vacancies on superconductivity in La3Ni2O7
The left diagram displays the regular lattice structure of La3Ni2O7, composed of alternating layers of NiO2 and LaO planes. The right diagram illustrates La3Ni2O7−δ with an oxygen vacancy at the inner apical position, marked by a black dashed circle.
