Enhancing the effective critical current density in a Nb superconducting thin film by cooling in an inhomogeneous magnetic field

• Autor(a) principal: Chaves, Davi Araujo Dalbuquerque
• Data de Publicação: 2021
• Outros Autores: Araújo, Ítalo M. de, Carmo, Danusa do, Colauto, Fabiano, Oliveira, Ana Augusta Mendonça de, Andrade, Antonio Marcos Helgueira de, Johansen, Tom Henning, Silhanek, Alejandro, Ortiz, Wilson Aires, Motta, Maycon
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UFRGS
• Texto Completo: http://hdl.handle.net/10183/241106
• topic: Supercondutores tipo II; Filmes finos supercondutores; Nióbio

Quantitative magneto-optical imaging of a type-II superconductor thin film cooled under zero, homogeneous, and inhomogeneous applied magnetic fields indicates that the latter procedure leads to an enhancement of the screening capacity. Such an observation is corroborated by both B-independent and B-dependent critical state model analyses. Furthermore, repulsive (attractive) vortex–(anti)vortex interactions were found to have a decisive role in the shielding ability, with initial states prepared with vortices resulting in a shorter magnetic flux front penetration depth than those prepared with antivortices. The proposed strategy could be implemented to boost the performance of thin superconducting devices.