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ancrage et dynamique d'un réseau de vortex dans le cadre d'un ancrage de surface

Abstract : We report in this thesis a work focussed on the study of pinning, structure and dynamic of a type II superconductor's vortex lattice (Nb-Ta, Pb-In, YBCO). Our contribution is first about pinning and depinning process of the vortex lattice in untwinned YBCO crystals, using continuous transport, alternative susceptibility, and magnetization measurements. We evidence the dominating role of the surface in the "solid" phase, resulting in the measured critical current, and the vortex coherence conservation in the "liquid" phase. Spin echo and Small Angle Neutrons Scattering (SANS) were performed on the vortex lattice of Nb-Ta and Pb-In samples. The vortex lattice velocity and its distribution were measured and analysed. Vortex lattice dynamical ordering was observed in Pb-In using SANS. The vortex lattice perfection and the transport current role are analysed by means of Bragg peak analysis. Vortex bending studies revealed that they are also pinned by the surface in these samples. And lastly, the vortex lattice deformation is studied in twinned YBCO using static SANS measurements.
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Contributor : Alain Pautrat <>
Submitted on : Tuesday, September 6, 2005 - 9:21:09 AM
Last modification on : Tuesday, February 5, 2019 - 12:12:22 PM
Long-term archiving on: : Friday, April 2, 2010 - 10:04:11 PM


  • HAL Id : tel-00010046, version 1


Alain Pautrat. ancrage et dynamique d'un réseau de vortex dans le cadre d'un ancrage de surface. Supraconductivité [cond-mat.supr-con]. Université de Caen, 2000. Français. ⟨tel-00010046⟩



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