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• W4313302595 abstract "Obtaining an accurate theoretical description of the emergent phenomena in oxide heterostructures is a major challenge. Recently, intriguing paramagnetic spin and pinned orbital moments have been discovered by x-ray magnetic circular dichroism measurements at the Cu $L_{2,3}$-edge of a tetragonal CuO/SrTiO$_3$ heterostructure. Using first principles calculations, we propose a scenario that explains both types of moments, based on the formation of oxygen vacancies in the TiO$_2$ interface layer. We show the emergence of a paramagnetic 2D electron gas hosted in the interface CuO layer. It is invisible at the Ti $L_{2,3}$-edge since the valence of the Ti atoms remains unchanged. Strong structural distortions breaking both the local and global fourfold rotation $C_4$ symmetries at the interface lead to the in-plane pinning of the Cu orbital moment close to the vacancy. Our results, and in particular the pinning of the orbital moment, may have implications for other systems, especially monoxide/dioxide interfaces with similar metal-oxygen bond length and weak spin-orbit coupling." @default.
• W4313302595 created "2023-01-06" @default.
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• W4313302595 date "2022-12-28" @default.
• W4313302595 modified "2023-10-11" @default.
• W4313302595 title "Oxygen vacancies at the origin of pinned moments in oxide interfaces: The example of tetragonal <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mi>CuO</mml:mi><mml:mo>/</mml:mo><mml:msub><mml:mrow><mml:mi>SrTiO</mml:mi></mml:mrow><mml:mn>3</mml:mn></mml:msub></mml:math>" @default.
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• W4313302595 doi "https://doi.org/10.1103/physrevb.106.235155" @default.
• W4313302595 hasPublicationYear "2022" @default.
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