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Meyerheim, H. L., Ernst, A., Mohseni, K., Maznichenko, I. V., Henk, J., Ostanin, S., Jedrecy, N., Klimenta, F., Zegenhagen, J., Schl├╝ter, C., Mertig, I., Kirschner, J.

Tuning the structure of ultrathin BaTiO3 films on Me(001) (Me = Fe, Pd, Pt) surfaces
Physical Review Letters 111, (10),pp 105501/1-5 (2013)
Using surface x-ray diffraction in combination with ab initio calculations, we demonstrate that the atomic structure of ultrathin BaTiO3 (BTO) films grown on Me(001) surfaces (Me = Fe, Pd, Pt) depends on subtle modifications of the interface chemical composition. A complete reversal of the surface termination from a BaO- [BTO on Fe(001)] to a TiO2-terminated film [BTO on Pt(001)] is observed which goes in parallel with the adsorption of submonolayer amounts of oxygen at metal hollow sites of the interface. Our results may suggest a new route to an overall control of both the surface and the interface geometry in BaTiO3/metal contacts.

TH-2013-27