PhD Thesis Defense by Ferran Vallès on 7 May 2019 at 11 am
Vortex pinning and creep in YBCO nanocomposite films grown by chemical solution deposition
by Ferran Vallès, Superconducting Materials and Large Scale Nanostructures (SUMAN) Group, ICMAB
Date: Tuesday, 7 May 2019
Time: 11 am
Venue: Sala d’actes Carles Miravitlles, ICMAB-CSIC
Abstract: The fabrication of superconducting YBa2Cu3O7–x nanocomposite films by the incorporation of nanoparticles has demonstrated to strongly enhance the vortex pinning performances under applied magnetic fields and to reduce the effective anisotropy, ensuring great potential for their use in a broad number of applications. Different nanoparticle concentrations, sizes and growth process conditions lead to a rich variety of defects in the films, whose vortex pinning and vortex creep effectiveness depends on temperature and the magnitude and orientation of the magnetic field.
It is shown that YBa2Cu3O7–x nanocomposites grown by chemical solution deposition provide simultaneously higher flux pinning and lower flux creep especially at low-intermediate temperatures and at low-intermediate magnetic fields. The region of this outstanding performance can be enlarged to larger fields and temperatures by further nanoengineering, where it has been shown that different defect landscapes can be particularly interesting for given operating conditions.
Supervisors:
- Prof. Teresa Puig, Superconducting Materials and Large Scale Nanostructures, ICMAB
- Dra. Anna Palau, Superconducting Materials and Large Scale Nanostructures, ICMAB
PhD Committee:
