TY  - JOUR
AU  - Rose, Marc-André
AU  - Šmíd, Břetislav
AU  - Vorokhta, Mykhailo
AU  - Slipukhina, Ivetta
AU  - Andrä, Michael
AU  - Bluhm, Hendrik
AU  - Duchoň, Tomáš
AU  - Ležaić, Marijana
AU  - Chambers, Scott A.
AU  - Dittmann, Regina
AU  - Müller, David
AU  - Gunkel, Felix
TI  - Identifying Ionic and Electronic Charge Transfer at Oxide Heterointerfaces
JO  - Advanced materials
VL  - 33
IS  - 4
SN  - 1521-4095
CY  - Weinheim
PB  - Wiley-VCH
M1  - FZJ-2020-04874
SP  - 2004132
PY  - 2021
AB  - The ability to tailor oxide heterointerfaces has led to novel properties in low‐dimensional oxide systems. A fundamental understanding of these properties is based on the concept of electronic charge transfer. However, the electronic properties of oxide heterointerfaces crucially depend on their ionic constitution and defect structure: ionic charges contribute to charge transfer and screening at oxide interfaces, triggering a thermodynamic balance of ionic and electronic structures. Quantitative understanding of the electronic and ionic roles regarding charge‐transfer phenomena poses a central challenge. Here, the electronic and ionic structure is simultaneously investigated at the prototypical charge‐transfer heterointerface, LaAlO3/SrTiO3. Applying in situ photoemission spectroscopy under oxygen ambient, ionic and electronic charge transfer is deconvoluted in response to the oxygen atmosphere at elevated temperatures. In this way, both the rich and variable chemistry of complex oxides and the associated electronic properties are equally embraced. The interfacial electron gas is depleted through an ionic rearrangement in the strontium cation sublattice when oxygen is applied, resulting in an inverse and reversible balance between cation vacancies and electrons, while the mobility of ionic species is found to be considerably enhanced as compared to the bulk. Triggered by these ionic phenomena, the electronic transport and magnetic signature of the heterointerface are significantly altered.
LB  - PUB:(DE-HGF)16
C6  - 33263190
UR  - <Go to ISI:>//WOS:000594757100001
DO  - DOI:10.1002/adma.202004132
UR  - https://juser.fz-juelich.de/record/888370
ER  -