OUT OF EQUILIBRIUM VORTEX DINAMYCS: interaction of vortices with triangular defects and transport currents

Talles Benites, Rafael Zadorosny

São Paulo State University (UNESP), School of engineering, Campus Ilha Solteira

NP2024-025.pdf

Abstract:
This research focuses on studying the influence of triangular defects, produced as blind-holes and dots, in a superconducting sample [1]. Three different orientations were use, e. g., left, right, and down triangle comparing with a current density flowing from left to right, simulating either a 3D or 2D materials using Fortran-90 language. The simulations were carried out in the time-dependent Ginzburg-Landau framework [2], considering a situation with zero applied magnetic field, where the vortices are known as kinematic vortices [3], and a varying transport current density. The results show that the symmetry and the type of defect are crucial to the electrical properties of the material, as well as the dynamics presented by the vortices. In particular, the current crowding effect plays an important rule on the vortex dynamics and the installed resistive state. As general conclusion, the knowledge of vortex dynamics are essential for development of future superconducting devices, mainly the ceramic ones, where defects are intrinsically present due to its multigranular character.
Acknowledgements:
FAPESP grant 2022/11299-6; CNPq. grant 310428/2020-1, and CAPES, financial code 001.
References:
[1] R. C. Santos, et al., Physics Letters A vol. 458, page 128595 (2023).
[2] R. J. Watts-Tobin, et al., Journal of low Temperature Physics vol. 42, page 459 (1981).
[3] A. Presotto, et al., Journal of physics: Condensed Matter vol. 32, page 435702 (2020).