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Title
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Co valence transformation in isopolar LaCoO₃/LaTiO₃ perovskite heterostructures via interfacial engineering
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Author
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Abstract
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| 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. |
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Language
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English
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Source (journal)
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Physical review materials / American Physical Society. - College Park, Md, 2017, currens
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Publication
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College Park, Md
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American Physical Society
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2020
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ISSN
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2475-9953
[online]
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DOI
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10.1103/PHYSREVMATERIALS.4.026001
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Volume/pages
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4
:2
(2020)
, p. 1-13
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Article Reference
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026001
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ISI
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000513551200007
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Medium
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E-only publicatie
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Full text (Publisher's DOI)
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Full text (open access)
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