Actions for Valence-state reflectometry of complex oxide heterointerfaces [electronic resource].

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Valence-state reflectometry of complex oxide heterointerfaces [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy. Office of Science, 2016.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description
Article numbers 16,013 : digital, PDF file
Additional Creators
Oak Ridge National Laboratory, United States. Department of Energy. Office of Science, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Emergent phenomena in transition-metal-oxide heterostructures such as interface superconductivity and magnetism have been attributed to electronic reconstruction, which, however, is difficult to detect and characterise. Here we overcome the associated difficulties to simultaneously address the electronic degrees of freedom and distinguish interface from bulk effects by implementing a novel approach to resonant X-ray reflectivity (RXR). Our RXR study of the chemical and valance profiles along the polar (001) direction of a LaCoO3 film on NdGaO3 reveals a pronounced valence-state reconstruction from Co3+ in the bulk to Co2+ at the surface, with an areal density close to 0.5 Co2+ ions per unit cell. An identical film capped with polar (001) LaAlO3 maintains the Co3+ valence over its entire thickness. As a result, we interpret this as evidence for electronic reconstruction in the uncapped film, involving the transfer of 0.5e– per unit cell to the subsurface CoO2 layer at its LaO-terminated polar surface.
Report Numbers
E 1.99:1329159
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Note
Published through SciTech Connect.
09/16/2016.
"KC0202020"
"ERKCS80"
npj Quantum Materials 1 ISSN 2397-4648 AM
Jorge E. Hamann-Borrero; Sebastian Macke; Woo Seok Choi; Ronny Sutarto; Feizhou He; Abdullah Radi; Ilya Elfimov; Robert J. Green; Maurits W. Haverkort; Volodymyr B. Zabolotnyy; Ho Nyung Lee; George A. Sawatzky; Vladimir Hinkov.
Funding Information
AC05-00OR22725
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