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Direct observations using scanning transmission electron microscopy unveil anintriguing interfacial bi-layer that enables epitaxial growth of a strain-free,monoclinic, bronze-phase VO2(B) thin film on a perovskite SrTiO3 (STO)substrate. We observe an ultrathin (2-3 unit cells) interlayer best describedas highly strained VO2(B) nanodomains combined with an extra (Ti,V)O2 layer onthe TiO2 terminated STO (001) surface. By forming a fully coherent interfacewith the STO substrate and a semi-coherent interface with the strain-freeepitaxial VO2(B) film above, the interfacial bi-layer enables the epitaxialconnection of the two materials despite their large symmetry and latticemismatch.

Nanoscale self-templating for oxide epitaxy with large symmetry mismatch