DataVXACS Applied Materials & InterfacesPaper
journal article·2024-04-29

Confinement-Induced Isosymmetric Metal–Insulator Transition in Ultrathin Epitaxial V2O3 Films

Simon Mellaerts, Claudio Bellani, Wei-Fan Hsu, Alberto Binetti, Koen Schouteden, Maria Recaman-Payo, Mariela Menghini, Juan Rubio-Zuazo, Jesús López-Sánchez, Jin Won Seo, Michel Houssa, Jean-Pierre Locquet

ACS Applied Materials & Interfaces
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Source abstract

Abstract

Dimensional confinement has shown to be an effective strategy to tune competing degrees of freedom in complex oxides. Here, we achieved atomic layered growth of trigonal vanadium sesquioxide (V 2 O 3 ) by means of oxygen-assisted molecular beam epitaxy. This led to a series of high-quality epitaxial ultrathin V 2 O 3 films down to unit cell thickness, enabling the study of the intrinsic electron correlations upon confinement. By electrical and optical measurements, we demonstrate a dimensional confinement-induced metal–insulator transition in these ultrathin films. We shed light on the Mott–Hubbard nature of this transition, revealing a vanishing quasiparticle weight as demonstrated by photoemission spectroscopy. Furthermore, we prove that dimensional confinement acts as an effective out-of-plane stress. This highlights the structural component of correlated oxides in a confined architecture, while opening an avenue to control both in-plane and out-of-plane lattice components by epitaxial strain and confinement, respectively.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Transition Metal Oxide Nanomaterials · Electronic and Structural Properties of Oxides · ZnO doping and properties

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Physics and Astronomy, KU Leuven, Celestijnenlaan 200D, 3001 Leuven, Belgium

Department of Materials Engineering, KU Leuven, Kasteelpark Arenberg 44, 3001 Leuven, Belgium

IMDEA Nanociencia, Calle Faraday 9, E29049 Madrid, Spain

BM25-SpLine, ESRF, 38043 Grenoble, France

Instituto de Ciencia de Materiales de Madrid (ICMM-CSIC), Madrid 28049, Spain

Departamento de Electrocerámica, Instituto de Cerámica y Vidrio - Consejo Superior de Investigaciones Científicas (ICV-CSIC), Calle Kelsen 5, Madrid 28049, Spain

Imec, Kapeldreef 75, Leuven 3001, Belgium

Funding

Ministerio de Econom??a y Competitividad · Ministerio de Econom??a, Industria y Competitividad, Gobierno de Espa??a · Ministerio de Ciencia e Innovaci??n · Interreg Vlaanderen-Nederland · Fonds Wetenschappelijk Onderzoek · Onderzoeksraad, KU Leuven · European Social Fund Plus

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