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Co valence transformation in isopolar LaCoO3 / LaTiO3 perovskite heterostructures via interfacial engineering

DOI: 10.1103/PhysRevMaterials.4.026001 DOI Help

Authors: Georgios Araizi-kanoutas (University of Amsterdam) , Jaap Geessinck (University of Twente) , Nicolas Gauquelin (University of Antwerp) , Steef Smit (University of Amsterdam) , Xanthe H. Verbeek (University of Amsterdam) , Shrawan K. Mishra (Indian Institute of Technology (BHU)) , Peter Bencok (Diamond Light Source) , Christoph Schlueter (PETRA III, DESY Photon Science) , Tien-lin Lee (Diamond Light Source) , Dileep Krishnan (University of Antwerp) , Jarmo Fatermans (University of Antwerp) , Jo Verbeeck (University of Antwerp) , Guus Rijnders (University of Twente) , Gertjan Koster (University of Twente) , Mark S. Golden (University of Amsterdam)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review Materials , VOL 4

State: Published (Approved)
Published: February 2020

Abstract: We report charge transfer up to a single electron per interfacial unit cell across nonpolar heterointerfaces from the Mott insulator LaTi O 3 to the charge transfer insulator LaCo O 3 . 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- 3 d 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 3 d 7 divalent Co, which displays a paramagnetic ground state. The number of LaTi O 3 / LaCo O 3 interfaces, the thickness of an additional, electronically insulating “break” layer between the LaTi O 3 and LaCo O 3 , and the LaCo O 3 film thickness itself in trilayers provide a trio of control knobs for average charge of the cobalt ions in LaCo O 3 , illustrating the efficacy of O − 2 p band alignment as a guiding principle for property design in complex oxide heterointerfaces.

Journal Keywords: Complex oxides; Heterostructures; Thin films; Transition-metal oxides; Scanning transmission electron microscopy; X-ray absorption spectroscopy; X-ray magnetic circular dichroism

Subject Areas: Physics, Materials


Instruments: I09-Surface and Interface Structural Analysis , I10-Beamline for Advanced Dichroism