酸化物へテロ構造中の酸素配位環境の直接観察と制御

抄録

Oxygen coordination environments in transition metal oxides often underpin a variety of structural and physical properties. Engineering the oxygen environments in oxide heterostructures is therefore a key for exploring novel phenomena but also for developing novel oxide-based electronic devices. In this article, we present, by ABF-STEM, direct observations of the oxygen coordination environments in heterostructures consisting of perovskite oxides SrRuO₃ and GdScO₃. We also show that the oxygen coordination environments and magneto-transport properties of the entire SrRuO₃ layer can be engineered through the heterointerface structures. The results demonstrate that the oxygen coordination environments can be used as a parameter controlling additional degrees of freedom in functional oxide heterostructures.