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

Author(s)

Cadorim, Leonardo Rodrigues ; Toledo, Lucas Veneziani de ; Ortiz, Wilson Aires ; Berger, Jorge ; Sardella, Edson

• Document type: Journal article
• Source: PHYSICAL REVIEW B; v. 107, n. 9, p. 8-pg., 2023-03-20.

Abstract

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. (AU)

• FAPESP's process: 20/03947-2 - Characterization of magnetic and electronic properties in mesoscopic and nanostructured multiband superconductors
• Grantee: Leonardo Rodrigues Cadorim
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
• FAPESP's process: 21/04655-8 - Machine learning and its applications in quantum physics: metrology, thermology, phase transitions and dynamical decoupling
• Grantee: Felipe Fernandes Fanchini
• Support Opportunities: Regular Research Grants
• FAPESP's process: 19/24618-0 - Clusters of vortices in mesoscopic type i superconducting films induced by thermal gradient
• Grantee: Lucas Veneziani de Toledo
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• FAPESP's process: 20/10058-0 - Study of the resistive state of meoscopic superconductors of finite thickness
• Grantee: Edson Sardella
• Support Opportunities: Regular Research Grants