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A series of epitaxial (LaVO3)6m(SrVO3)m superlattices having the same nominalcomposition as La6/7Sr1/7VO3, a Mott-Hubbard insulator, were grown withpulsed-laser deposition on [001]-oriented SrTiO3 substrates, and theirsuperlattice period was varied. When m=1, the insulating resistivity ofbulk-like La6/7Sr1/7VO3 is obtained; however, an increase in the periodicity(m>=2) results in metallic samples. Comparison of the superlattice periodicitywith the coherence length of charge carriers in perovskite oxideheterostructures are used to understand these observations. Afilling-controlled insulator-metal transition was induced by placing a singledopant layer of SrVO3 within LaVO3 layers of varying thickness.

Effect of charge modulation in (LaVO3)m(SrVO3)n superlattices on the insulator-metal transition