| Autor: |
Araizi-Kanoutas, G., Geessinck, J., Gauquelin, N., Smit, S., Verbeek, X.H., Mishra, S.K., Bencok, P., Schlueter, C., Lee, T.-L., Krishnan, D., Fatermans, J., Verbeeck, J., Rijnders, G., Koster, G., Golden, M.S. |
| Přispěvatelé: |
Hard Condensed Matter (WZI, IoP, FNWI), WZI (IoP, FNWI), IoP Other Research, IoP (FNWI) |
| Jazyk: |
angličtina |
| Rok vydání: |
2020 |
| Zdroj: |
Physical Review Materials, 4(2):026001. American Physical Society |
| ISSN: |
1098-0121 |
| Popis: |
We report charge transfer up to a single electron per interfacial unit cell across nonpolar heterointerfaces from the Mott insulator LaTiO3 to the charge transfer insulator LaCoO3. In high-quality bi- and trilayer systems grown using pulsed laser deposition, soft x-ray absorption, dichroism, and scanning transmission electron microscopy-electron energy loss spectroscopy are used to probe the cobalt-3d electron count and provide an element-specific investigation of the magnetic properties. The experiments show the cobalt valence conversion is active within 3 unit cells of the heterointerface, and able to generate full conversion to 3d7 divalent Co, which displays a paramagnetic ground state. The number of LaTiO3/LaCoO3 interfaces, the thickness of an additional, electronically insulating "break" layer between the LaTiO3 and LaCoO3, and the LaCoO3 film thickness itself in trilayers provide a trio of control knobs for average charge of the cobalt ions in LaCoO3, illustrating the efficacy of O-2p band alignment as a guiding principle for property design in complex oxide heterointerfaces. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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