Observation of strontium segregation in LaAlO3/SrTiO3 and NdGaO3/SrTiO3 oxide heterostructures by X-ray photoemission spectroscopy

LaAlO3 and NdGaO3 thin films of different thicknesses have been grown by pulsed laser deposition on TiO2-terminated SrTiO3 single crystals and investigated by soft X-ray photoemission spectroscopy. The surface sensitivity of the measurements has been tuned by varying photon energy hν and emission an...

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Main Authors:	Uwe Treske, Nadine Heming, Martin Knupfer, Bernd Büchner, Andreas Koitzsch, Emiliano Di Gennaro, Umberto Scotti di Uccio, Fabio Miletto Granozio, Stefan Krause
Format:	Article
Language:	English
Published:	AIP Publishing LLC 2014-01-01
Series:	APL Materials
Online Access:	http://dx.doi.org/10.1063/1.4861797

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spelling	doaj-7e6893fdc2094103872a3062cbcad19a2020-11-24T21:56:15ZengAIP Publishing LLCAPL Materials2166-532X2014-01-0121012108012108-810.1063/1.4861797010401APMObservation of strontium segregation in LaAlO3/SrTiO3 and NdGaO3/SrTiO3 oxide heterostructures by X-ray photoemission spectroscopyUwe Treske0Nadine Heming1Martin Knupfer2Bernd Büchner3Andreas Koitzsch4Emiliano Di Gennaro5Umberto Scotti di Uccio6Fabio Miletto Granozio7Stefan Krause8Institute for Solid State Research, IFW-Dresden, P.O. Box 270116, DE-01171 Dresden, GermanyInstitute for Solid State Research, IFW-Dresden, P.O. Box 270116, DE-01171 Dresden, GermanyInstitute for Solid State Research, IFW-Dresden, P.O. Box 270116, DE-01171 Dresden, GermanyInstitute for Solid State Research, IFW-Dresden, P.O. Box 270116, DE-01171 Dresden, GermanyInstitute for Solid State Research, IFW-Dresden, P.O. Box 270116, DE-01171 Dresden, GermanyCNR-SPIN and Dipartimento di Fisica, Complesso Universitario di Monte S. Angelo, Via Cintia, 80126 Naples, ItalyCNR-SPIN and Dipartimento di Fisica, Complesso Universitario di Monte S. Angelo, Via Cintia, 80126 Naples, ItalyCNR-SPIN and Dipartimento di Fisica, Complesso Universitario di Monte S. Angelo, Via Cintia, 80126 Naples, ItalyHelmholtz-Zentrum Berlin, BESSY, Albert-Einstein-Str. 15, 12489 Berlin, GermanyLaAlO3 and NdGaO3 thin films of different thicknesses have been grown by pulsed laser deposition on TiO2-terminated SrTiO3 single crystals and investigated by soft X-ray photoemission spectroscopy. The surface sensitivity of the measurements has been tuned by varying photon energy hν and emission angle Θ. In contrast to the core levels of the other elements, the Sr 3d line shows an unexpected splitting for higher surface sensitivity, signaling the presence of a second strontium component. From our quantitative analysis we conclude that during the growth process Sr atoms diffuse away from the substrate and segregate at the surface of the heterostructure, possibly forming strontium oxide.http://dx.doi.org/10.1063/1.4861797
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Uwe Treske Nadine Heming Martin Knupfer Bernd Büchner Andreas Koitzsch Emiliano Di Gennaro Umberto Scotti di Uccio Fabio Miletto Granozio Stefan Krause
spellingShingle	Uwe Treske Nadine Heming Martin Knupfer Bernd Büchner Andreas Koitzsch Emiliano Di Gennaro Umberto Scotti di Uccio Fabio Miletto Granozio Stefan Krause Observation of strontium segregation in LaAlO3/SrTiO3 and NdGaO3/SrTiO3 oxide heterostructures by X-ray photoemission spectroscopy APL Materials
author_facet	Uwe Treske Nadine Heming Martin Knupfer Bernd Büchner Andreas Koitzsch Emiliano Di Gennaro Umberto Scotti di Uccio Fabio Miletto Granozio Stefan Krause
author_sort	Uwe Treske
title	Observation of strontium segregation in LaAlO3/SrTiO3 and NdGaO3/SrTiO3 oxide heterostructures by X-ray photoemission spectroscopy
title_short	Observation of strontium segregation in LaAlO3/SrTiO3 and NdGaO3/SrTiO3 oxide heterostructures by X-ray photoemission spectroscopy
title_full	Observation of strontium segregation in LaAlO3/SrTiO3 and NdGaO3/SrTiO3 oxide heterostructures by X-ray photoemission spectroscopy
title_fullStr	Observation of strontium segregation in LaAlO3/SrTiO3 and NdGaO3/SrTiO3 oxide heterostructures by X-ray photoemission spectroscopy
title_full_unstemmed	Observation of strontium segregation in LaAlO3/SrTiO3 and NdGaO3/SrTiO3 oxide heterostructures by X-ray photoemission spectroscopy
title_sort	observation of strontium segregation in laalo3/srtio3 and ndgao3/srtio3 oxide heterostructures by x-ray photoemission spectroscopy
publisher	AIP Publishing LLC
series	APL Materials
issn	2166-532X
publishDate	2014-01-01
description	LaAlO3 and NdGaO3 thin films of different thicknesses have been grown by pulsed laser deposition on TiO2-terminated SrTiO3 single crystals and investigated by soft X-ray photoemission spectroscopy. The surface sensitivity of the measurements has been tuned by varying photon energy hν and emission angle Θ. In contrast to the core levels of the other elements, the Sr 3d line shows an unexpected splitting for higher surface sensitivity, signaling the presence of a second strontium component. From our quantitative analysis we conclude that during the growth process Sr atoms diffuse away from the substrate and segregate at the surface of the heterostructure, possibly forming strontium oxide.
url	http://dx.doi.org/10.1063/1.4861797
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Observation of strontium segregation in LaAlO3/SrTiO3 and NdGaO3/SrTiO3 oxide heterostructures by X-ray photoemission spectroscopy

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