Polar-discontinuity-retaining A-site intermixing and vacancies at SrTiO3/LaAlO3 interfaces

Article

关键词: PHASE-TRANSITION;    OXIDIZING CONDITIONS;    DOPED SRTIO3;    DIFFRACTION;    OXIDES;   

DOI  :  10.1103/PhysRevB.85.045401

来源: SCIE

【 摘 要 】

Our anomalous surface x-ray diffraction study of the interface between SrTiO3(001) substrates and thin polar films of LaAlO3 shows La/Sr interdiffusion leading to neutrally charged Sr1-1.5xLaxO layers. From a thickness of two unit cells, the LaAlO3 film's interior retains its polar stacking sequence, which is compensated by a cationic compositional change of the substrate's terminating TiO2 layer. While such valence-retaining A-site intermixing does not resolve the polar catastrophe, it may be a general feature at oxide interfaces influencing the electronic and magnetic properties.

【 授权许可】

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