title: Band alignment, built-in potential, and the absence of conductivity at the LaCrO3/SrTiO3(001) heterojunction.
abstract: Core-level and valence-band x-ray photoemission spectra measured for molecular-beam-epitaxy-grown LaCrO(3)/SrTiO(3)(001) yield band offsets and potential gradients within the LaCrO(3) sufficient to trigger an electronic reconstruction to alleviate the polarity mismatch. Yet, the interface is insulating. Based on first principles calculations, we attribute this unexpected result to interfacial cation mixing combined with charge redistribution within CrO(2) layers, enabled by low-lying d states within LaCrO(3), which suppresses an electronic reconstruction.
authors.affiliation: Pacific Northwest National Laboratory, Richland, Washington 99352, USA. sa.chambers@pnl.gov
authors.forename: S A
authors.initials: SA
authors.lastname: Chambers
authors.forename: L
authors.initials: L
authors.lastname: Qiao
authors.forename: T C
authors.initials: TC
authors.lastname: Droubay
authors.forename: T C
authors.initials: TC
authors.lastname: Kaspar
authors.forename: B W
authors.initials: BW
authors.lastname: Arey
authors.forename: P V
authors.initials: PV
authors.lastname: Sushko