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


Vonk, V. and Huijben, J. and Kukuruznyak, D. and Stierle, A. and Hilgenkamp, H. and Brinkman, A. and Harkema, S. (2012) Polar-discontinuity-retaining A-site intermixing and vacancies at SrTiO3/LaAlO3 interfaces. Physical review B: Condensed matter, 85 (4). 1 - 5. ISSN 0163-1829

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Abstract: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
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Copyright:© American Physical Society
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Link to this item:http://purl.utwente.nl/publications/82009
Official URL:https://doi.org/10.1103/PhysRevB.85.045401
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