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

V. Vonk, J. Huijben, D. Kukuruznyak, A. Stierle, H. Hilgenkamp, A. Brinkman, S. Harkema

Research output: Contribution to journalArticleAcademicpeer-review

47 Citations (Scopus)
101 Downloads (Pure)


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
Original languageEnglish
Article number045401
Pages (from-to)1-5
Number of pages5
JournalPhysical Review B (Condensed Matter and Materials Physics)
Issue number4
Publication statusPublished - 2012


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