Atomic Level Engineering of Structural and Functional Properties of Transition Metal Oxides

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  • 原子レベル構造制御による遷移金属酸化物の機能開発
  • 受賞記念講演 : 平成28年度研究進歩賞 原子レベル構造制御による遷移金属酸化物の機能開発
  • ジュショウ キネン コウエン : ヘイセイ 28ネンド ケンキュウ シンポショウ ゲンシ レベル コウゾウ セイギョ ニ ヨル センイ キンゾク サンカブツ ノ キノウ カイハツ

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Abstract

<p>Metal-oxygen bonds are responsible for a broad spectrum of functional properties of transition-metal oxides, and engineering the bonds is a key for exploring their properties. Artificial oxide heterostructures with chemically abrupt interfaces have provided a platform for engineering bonding geometries that could lead to emergent phenomena not seen in bulk oxides. In this paper, we demonstrate that interfacially engineering oxygen displacement is a good route for exploring structural and functional properties of oxides. Our high-resolution annular bright-field scanning transmission electron microscopy observations revealed that interfacial oxygen displacement determines metal-oxygen bond angles in entire heterostructures and the magnitude of the displacements can be adjusted by controlling propagations of the oxygen octahedral rotations across the heterointerface. We also show that by heterostructuring an itinerant ferromagnet SrRuO3 with Ca0.5Sr0.5TiO3 (0–4 monolayers thick) grown on a GdScO3 substrate, structural phase and magnetic anisotropy of SrRuO3 can be controlled through the interfacial engineering of its oxygen displacement.</p>

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