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ETUDE DES INHOMOGENEITES AFFECTANT LES CARACTERISTIQUES DES FILMS YBa2Cu3O7-d ET DES SUPERRESEAUX (YBa2Cu3O7-d /LaAlO3)n : CROISSANCE ET PROPRIETES

Abstract : This manuscript is devoted to the study of crystallographic and physical properties of superconductor YBCO thin films and superconductor/insulator (YBCO/LAO)n superlattices. The first stage of this work was to optimize the YBCO thin film deposition. Elaboration of a new physical model allows us to determine a critical temperature distribution inside the films thickness. Nevertheless, no homogeneous critical temperature inside the films can be obtained. This work shows that the interface strains modify the crystallographic and physical properties. We developed a new simulation method concerning the XRD peak shape analysis which allows us to determine YBCO cell deformation profile along the axis. About superlattices, effects of thickness on the physical and structural properties have been noticed. Transmission Electron Microscopy exhibits existence of structural defects in the films. Ending, the physical model proposed in the present work provides important informations regarding the magnetic interaction between two superconductor layers, which seems to limit application of these superlattices in the realization of complex electronic devices.
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https://tel.archives-ouvertes.fr/tel-00546686
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Submitted on : Tuesday, December 14, 2010 - 3:26:51 PM
Last modification on : Tuesday, February 5, 2019 - 12:12:22 PM
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  • HAL Id : tel-00546686, version 1

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Yohann Thimont. ETUDE DES INHOMOGENEITES AFFECTANT LES CARACTERISTIQUES DES FILMS YBa2Cu3O7-d ET DES SUPERRESEAUX (YBa2Cu3O7-d /LaAlO3)n : CROISSANCE ET PROPRIETES. Matière Condensée [cond-mat]. Université de Caen, 2009. Français. ⟨tel-00546686⟩

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