Local polarization and valence distribution in LaNiO3/LaMnO3 heterostructures

Abstract

The inside of the electrical double layer at perovskite oxide heterointerfaces is examined. Here, we report the local polarization and valence distribution in LaNiO 3 /LaMnO 3 and LaMnO 3 /LaNiO 3 bilayers on a SrTiO 3 (001) substrate. Simultaneous measurements of two aspects of the structure are realized by using Bayesian inference based on resonant-and nonresonant-surface X-ray diffraction data. The results show that the average Mn valences are Mn 3.12+ and Mn 3.19+ for the two samples. The intensity of their local electric field is ∼1 GV/m and the direction of the field points from LaMnO 3 to LaNiO 3 .