Abstract
Our anomalous surface x-ray diffraction study of the interface between SrTiO${}_{3}$(001) substrates and thin polar films of LaAlO${}_{3}$ shows La/Sr interdiffusion leading to neutrally charged Sr${}_{1\ensuremath{-}1.5x}$La${}_{x}$O layers. From a thickness of two unit cells, the LaAlO${}_{3}$ film's interior retains its polar stacking sequence, which is compensated by a cationic compositional change of the substrate's terminating TiO${}_{2}$ 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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