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Orbital reflectometry of oxide heterostructures

The occupation of d orbitals controls the magnitude and anisotropy of the inter-atomic electron transfer in transition-metal oxides and hence exerts a key influence on their chemical bonding and physical properties. Atomic-scale modulations of the orbital occupation at surfaces and interfaces are be...

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Hauptverfasser: Benckiser, Eva (VerfasserIn) , Haverkort, Maurits W. (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 06 February 2011
In: Nature materials
Year: 2011, Jahrgang: 10, Heft: 3, Pages: 189-193
ISSN:1476-4660
DOI:10.1038/nmat2958
Online-Zugang:Verlag, Volltext: http://dx.doi.org/10.1038/nmat2958
Verlag, Volltext: http://www.nature.com/nmat/journal/v10/n3/abs/nmat2958.html
Volltext
Verfasserangaben:Eva Benckiser, Maurits W. Haverkort, Sebastian Brück, Eberhard Goering, Sebastian Macke, Alex Frañó, Xiaoping Yang, Ole K. Andersen, Georg Cristiani, Hanns-Ulrich Habermeier, Alexander V. Boris, Ioannis Zegkinoglou, Peter Wochner, Heon-Jung Kim, Vladimir Hinkov and Bernhard Keimer

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520 |a The occupation of d orbitals controls the magnitude and anisotropy of the inter-atomic electron transfer in transition-metal oxides and hence exerts a key influence on their chemical bonding and physical properties. Atomic-scale modulations of the orbital occupation at surfaces and interfaces are believed to be responsible for massive variations of the magnetic and transport properties, but could not thus far be probed in a quantitative manner. Here we show that it is possible to derive quantitative, spatially resolved orbital polarization profiles from soft-X-ray reflectivity data, without resorting to model calculations. We demonstrate that the method is sensitive enough to resolve differences of ∼3% in the occupation of Ni eg orbitals in adjacent atomic layers of a LaNiO3-LaAlO3 superlattice, in good agreement with ab initio electronic-structure calculations. The possibility to quantitatively correlate theory and experiment on the atomic scale opens up many new perspectives for orbital physics in transition-metal oxides. 
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