Bouwmeester, Rosa Luca

Brinkman, Alexander

de Hond, Kit

Gauquelin, Nicolas

Koster, Gertjan

Verbeeck, Johan

Abstract: A topological insulating phase has theoretically been predicted for the thermodynamically unstable perovskite phase of YBiO3. Here, it is shown that the crystal structure of the Y-Bi-O system can be controlled by using a BaBiO3 buffer layer. The BaBiO3 film overcomes the large lattice mismatch of 12% with the SrTiO3 substrate by forming a rocksalt structure in between the two perovskite structures. Depositing an YBiO3 film directly on a SrTiO3 substrate gives a fluorite structure. However, when the Y-Bi-O system is deposited on top of the buffer layer with the correct crystal phase and comparable lattice constant, a single oriented perovskite structure with the expected lattice constants is observed

Stabilization of the perovskite phase in the Y-Bi-O system by using a BaBiO\u2083 buffer layer

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