Araizi-Kanoutas, Georgios

Bencok, Peter

Fatermans, Jarmo

Gauquelin, Nicolas

Geessinck, Jaap

Golden, Mark S.

Koster, Gertjan

Krishnan, Dileep

Lee, Tien-Lin

Mishra, Shrawan K.

Rijnders, Guus

Schlueter, Christoph

Smit, Steef

Verbeeck, Johan

Verbeek, Xanthe H.

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 3d(7) 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

Institutional Repository Universiteit Antwerpen

Co valence transformation in isopolar LaCoO\u2083/LaTiO\u2083 perovskite heterostructures via interfacial engineering

Co valence transformation in isopolar LaCoO\u2083/LaTiO\u2083 perovskite heterostructures via interfacial engineering

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Institutional Repository Universiteit Antwerpen