fig1

Figure 1. Crystal structure characterization of epitaxial NNO and (NNO/PTO)3 thin films. Out-of-plane XRD θ-2θ scans of NNO thin films (A) and (NNO/PTO)3. (B) grown on (001) Nb-STO substrates. (C) Low-magnification HAADF-STEM image of the (NNO/PTO)3 film grown on Nb-STO substrates and EDS mapping of the (NNO/PTO)3/Nb-STO heterointerface.