A series of epitaxial (LaVO3)6m(SrVO3)m superlattices having the same nominal composition as La6∕7Sr1∕7VO3, a Mott-Hubbard insulator, was grown with pulsed-laser deposition on [001]-oriented SrTiO3 substrates, and their superlattice period was varied. When m=1, the insulating resistivity of bulklike La6∕7Sr1∕7VO3 is obtained; however, an increase in the periodicity (m⩾2) results in metallic samples. Comparison of the superlattice periodicity with the coherence length of charge carriers in perovskite oxide heterostructures is used to understand these observations. A filling-controlled insulator-metal transition was induced by placing a single dopant layer of SrVO3 within LaVO3 layers of varying thickness.
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Sheets et al. (2007) studied this question.
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