- Author
-
G. Araizi-Kanoutas
J. Geessinck
N. Gauquelin
S. Smit
X.H. Verbeek
S.K. Mishra
P. Bencok
C. Schlueter
T.-L. Lee
D. Krishnan
J. Fatermans
J. Verbeeck
G. Rijnders
G. Koster
M.S. Golden - Date
- 2-2020
- Title
- Co valence transformation in isopolar LaCo O3/LaTi O3 perovskite heterostructures via interfacial engineering
- Journal
- Physical Review Materials
- Volume | Issue number
- 4 | 2
- Article number
- 026001
- Number of pages
- 13
- Document type
- Article
- Faculty
- Faculty of Science (FNWI)
- Institute
- Van der Waals-Zeeman Institute (WZI)
Institute of Physics (IoP) - Abstract
-
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.
- URL
- go to publisher's site
- Other links
- Link to publication in Scopus
- Language
- English
- Note
- ©2020 American Physical Society
- Persistent Identifier
- https://hdl.handle.net/11245.1/f06d6491-3e57-4c49-8b6d-c175e9bb3c6d
- Downloads
-
PhysRevMaterials.4.026001(Final published version)
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