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  Valence-state reflectometry of complex oxide heterointerfaces

Hamann-Borrero, J. E., Macke, S., Choi, W. S., Sutarto, R., He, F., Radi, A., et al. (2017). Valence-state reflectometry of complex oxide heterointerfaces. npj Quantum Materials, 1: 16013, pp. 1-6. doi:10.1038/npjquantmats.2016.13.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-D8DB-F Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-D8F5-4
Genre: Journal Article

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 Creators:
Hamann-Borrero, Jorge E.1, Author
Macke, Sebastian1, Author
Choi, Woo Seok1, Author
Sutarto, Ronny1, Author
He, Feizhou1, Author
Radi, Abdullah1, Author
Elfimov, Ilya1, Author
Green, Robert J.2, Author              
Haverkort, Maurits W.3, Author              
Zabolotnyy, Volodymyr B.1, Author
Lee, Ho Nyung1, Author
Sawatzky, George A.1, Author
Hinkov, Vladimir1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863445              
3Maurits Haverkort, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863455              

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 Abstract: 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. 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.

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Language(s): eng - English
 Dates: 2017-09-162017-09-16
 Publication Status: Published in print
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Title: npj Quantum Materials
Source Genre: Journal
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Publ. Info: [London] : Nature Publishing Group
Pages: - Volume / Issue: 1 Sequence Number: 16013 Start / End Page: 1 - 6 Identifier: Other: 2397-4648
CoNE: /journals/resource/2397-4648