Journal
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
Volume 13, Issue 7, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssr.201800679
Keywords
buffer layers; perovskite oxides; pulsed laser deposition; scanning transmission electron microscopy; topological insulators
Funding
- NWO through a VICI grant
- GOA project Solarpaint of the University of Antwerp
- Hercules Fund from the Flemish Government
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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.
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