Investigação de sistemas granulares supercondutores utilizando a formulação T-A

Abstract

Granular superconducting materials are consisted of grains, with superior superconducting properties, and weak links (WL) regions, with reduced superconducting properties. Those WLs limit the transport current capacity of a superconductor, but they also exhibit effects that can be explored in possible superconducting devices. A granular system containing two grains and a single WL on a thin film shows a magnetic response similar to those observed in granular materials, allowing one to study grain-intergrain relations by this system. In this work, we implemented the T-A formulation, commonly used to model high critical temperature superconducting cables, to model the granular system mentioned, with 45°, 60°, and 90° tilted WLs. The results we obtained showed that the T-A formulation is able to reproduce experimental results of magnetic field distribution through the samples with orthogonal and tilted WL observed when subject to a perpendicular applied magnetic field. In particular, the relationship between transparency and the angle between discontinuity lines (d-lines), τ = cos θ, was recovered from the simulated model.