Closed vortex state in three-dimensional mesoscopic superconducting films under an applied transport current

• Autor(a) principal: Cadorim, Leonardo Rodrigues [UNESP]
• Data de Publicação: 2023
• Outros Autores: De Toledo, Lucas Veneziani [UNESP], Ortiz, Wilson Aires, Berger, Jorge, Sardella, Edson [UNESP]
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1103/PhysRevB.107.094515; http://hdl.handle.net/11449/249803

By using the full 3D generalized time-dependent Ginzbug-Landau equation, we study a long superconducting film of finite width and thickness under an applied transport current. We show that, for sufficiently large thickness, the vortices and the antivortices become curved before they annihilate each other. As they approach the center of the sample, their ends combine, producing a single closed vortex. We also determine the critical values of the thickness for which the closed vortex sets in for different values of the Ginzburg-Ladau parameter. Finally, we propose a model of how to detect a closed vortex experimentally.