Band alignment, built-in potential, and the absence of conductivity at the LaCrO3/SrTiO3(001) heterojunction

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 insulat...

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Bibliographic Details
Published in:Physical review letters 2011-11, Vol.107 (20), p.206802-206802
Main Authors: Chambers, S A, Qiao, L, Droubay, T C, Kaspar, T C, Arey, B W, Sushko, P V
Format: Article
Language:English
Subjects:
ALIGNMENT
BENDING
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Environmental Molecular Sciences Laboratory
HETEROJUNCTIONS
SCREENS
VALENCE
X-RAY PHOTOELECTRON SPECTROSCOPY
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.107.206802