Interplay of Inter- and Intra-Granular Vortices in Extended Superconducting Tapes: Impact of
Defect Structures
Talles Benites1, Alice Presotto1, Adriana Guiráo Presotto1, J. Barba-Ortega2, André Luiz Malvezzi3, Edson Sardella3, Elwis Carlos
Sartorelli Duarte4, Rodolfo Izquierdo1, Rafael Zadorosny1
1 Departamento de Física e Química, Faculdade de Engenharia, Universidade Estadual Paulista (UNESP), Caixa Postal 31, 15385-000, Ilha Solteira, SP, Brazil
2 Departamento de Física, Universidad Nacional de Colombia, Bogotá, Colombia
3 Departamento de Física, Faculdade de Ciências, Universidade Estadual Paulista (UNESP), Caixa Postal 473, 17033-360, Bauru-SP, Brazil
4 Universidade Estadual de Maringá (UEM), Câmpus Regional de Goioerê, Av. Reitor Zeferino Vaz, s/n, Jardim Universitário, 87.360-000 Goioerê-PR,Brazil
Abstract:
This work investigated the vortex dynamics in granular semi-infinite superconducting tapes, which are composed of distinct superconducting grains interconnected by weak links (WL). Those WLs can be understood as Josephson junctions [1]. Three different systems were simulated: (i) a homogeneous defect-free grain, (ii) grains with a square hole defect at their center, (iii) and grains with four square holes defects [2]. These systems were subjected to a transport current and an external magnetic field. The simulations were implemented using the generalized time-dependent Ginzburg-Landau (GTDGL) framework in the FORTRAN-90 language [3]. It was observed that, at low magnetic fields, the flux-flow regime began at the same current and at the intergrain for all systems. However, as the field is increased, the onset current is differed among the samples, which was attributed to the magnetic flux in the initial state within each grain. From the analysis of the IV characteristics, at least two distinct jumps were observed in all systems: the first associated with flux flow in the intergrain region, and the second corresponding to a shared flux-flow regime, where vortices moved through both intragranular and intergranular regions.
Acknowledgements:
CNPq grant 310428/2021-1, and CAPES, financial code 001.
References:
[1] P Sunwong et al., Supercond. Sci. Technol. 26 (2013) 095006.
[2] R. C. Santos, et al., Phys. Lett. A 458 (2023) 128595.
[3] W. D. Gropp, Journal of Computational Physics 123 (1996) 254.
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