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- W3136398915 abstract "Dedicated control of oxygen vacancies is an important route to functionalizing complex oxide films. It is well-known that tensile strain significantly lowers the oxygen vacancy formation energy, whereas compressive strain plays a minor role. Thus, atomically reconstruction by extracting oxygen from a compressive-strained film is challenging. Here we report an unexpected LaCoO2.5 phase with a zigzag-like oxygen vacancy ordering through annealing a compressive-strained LaCoO3 in vacuum. The synergetic tilt and distortion of CoO5 square pyramids with large La and Co shifts are quantified using scanning transmission electron microscopy. The large in-plane expansion of CoO5 square pyramids weaken the crystal-field splitting and facilitated the ordered high-spin state of Co2+, which produces an insulating ferromagnetic state with a Curie temperature of ~284 K and a saturation magnetization of ~0.25 {mu}B/Co. These results demonstrate that extracting targeted oxygen from a compressive-strained oxide provides an opportunity for creating unexpected crystal structures and novel functionalities." @default.
- W3136398915 created "2021-03-29" @default.
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- W3136398915 date "2021-03-25" @default.
- W3136398915 modified "2023-10-15" @default.
- W3136398915 title "Near-room temperature ferromagnetic insulating state in highly distorted LaCoO2.5 with CoO5 square pyramids" @default.
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- W3136398915 doi "https://doi.org/10.1038/s41467-021-22099-y" @default.
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