The inside of the electrical double layer at perovskite oxide heterointerfaces is examined. Here, we report the local polarization and valence distribution in LaNiO3/LaMnO3 and LaMnO3/LaNiO3 bilayers on a SrTiO3 (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 Mn3.12+ and Mn3.19+ for the two samples. The intensity of their local electric field is ∼1~GV/m and the direction of the field points from LaMnO3 to LaNiO3.
@article{arxiv.2104.12322,
title = {Local polarization and valence distribution in LaNiO3/LaMnO3 heterostructures},
author = {Masato Anada and Satoshi Sakaguchi and Kazuki Nagai and Miho Kitamura and Koji Horiba and Hiroshi Kumigashira and Yusuke Wakabayashi},
journal= {arXiv preprint arXiv:2104.12322},
year = {2021}
}