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Rare earth vanadates thin films and superlattices epitaxial growth : towards multiferroics properties

Abstract : Recently, a new origin for ferroelectricity has been discovered and studied in perovskite superlattices ABO₃/A'BO₃, (ABO₃ with A = rare earth or alkaline earth, B = 3d, 4d or 5d transition metal). This phenomenon, called improper hybrid ferroelectricity, rises considerable interest, since it may yield the emergence of a multiferroic or even magnetoelectric behavior in magnetic perovskites. Among the promising perovskite materials for such a ferroelectric and magnetoelectric behavior, rare earth vanadates (compounds RVO₃) have been identified. The thesis work reported in this manuscript aimed at studying RVO₃/R'VO₃ superlattices and their physical properties. The epitaxial growth of PrVO₃ and LaVO₃ thin films by ozone-assisted molecular beam epitaxy (MBE) is thoroughly investigated. An optimization of the growth process is carried out, mainly supported by in situ electron diffraction (RHEED), and ex situ X-ray diffraction (XRD). The epitaxy with layer-by-layer 2D growth mode for LaVO₃ and PrVO₃ on SrTiO₃(001) allows the deposition of high quality LaVO₃/PrVO₃ superlattices. The analysis by electrons microscopy (TEM) highlights abrupt interfaces and enables the determination of structural variants and atomic displacements, key elements for the emergence of improper hybrid ferroelectricity. The first results on the superlattices’ electric properties suggest the occurrence of a ferroelectric behavior in a (LaVO₃)₁/(PrVO₃)₁ superlattice.
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Submitted on : Tuesday, July 13, 2021 - 12:15:43 PM
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Gauthier Masset. Rare earth vanadates thin films and superlattices epitaxial growth : towards multiferroics properties. Materials Science [cond-mat.mtrl-sci]. Université de Lorraine, 2020. English. ⟨NNT : 2020LORR0279⟩. ⟨tel-03285413⟩



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