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