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000850927 1001_ $$0P:(DE-Juel1)130677$$aGunkel, F.$$b0$$eCorresponding author
000850927 245__ $$aCharge-transfer in B-site-depleted NdGaO 3 /SrTiO 3 heterostructures
000850927 260__ $$aMelville, NY$$bAIP Publ.$$c2018
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000850927 520__ $$aCation stoichiometry has been identified as a major key in establishing 2-dimensional electron gases (2DEGs) in oxide heterostructures. Here, we discuss a 2DEG formation scenario in B-site deficient perovskite/perovskite heterostructures, which previously were predicted to show insulating behavior. We elaborate an ionic picture based on oxygen-vacancy-buffered B-site vacancy defects in the polar oxide layer that yields a continuous transition from 2DEG formation to less conducting interfaces to insulating interfaces with increasing B-site deficiency. Experimentally, a corresponding modulation of charge transfer across NdGaO3/SrTiO3 interfaces is inferred using hard x-ray photoelectron spectroscopy analysis and transport experiments. With increasing B-site deficiency, we observe a decrease of the interfacial Ti3+ core level contribution, indicating a reduced charge transfer at the interface. This result is corroborated by temperature-dependent transport measurements, revealing increased low temperature resistance, with a dominant influence of a reduced electron density in the Ga-depleted sample. We consider a redistribution of oxygen vacancies in the B-site deficient polar oxide layer to explain the alleviated interface reconstruction, adding a new perspective on potential built-up in polar-oxide thin films.
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000850927 7001_ $$0P:(DE-Juel1)138081$$aLenser, C.$$b1
000850927 7001_ $$0P:(DE-Juel1)159254$$aBaeumer, C.$$b2
000850927 7001_ $$00000-0003-4659-4329$$aBorgatti, F.$$b3
000850927 7001_ $$0P:(DE-HGF)0$$aOffi, F.$$b4
000850927 7001_ $$0P:(DE-HGF)0$$aPanaccione, G.$$b5
000850927 7001_ $$0P:(DE-Juel1)130620$$aDittmann, R.$$b6
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