| Grant number: | 20/10058-0 |
| Support Opportunities: | Regular Research Grants |
| Start date: | April 01, 2021 |
| End date: | March 31, 2023 |
| Field of knowledge: | Physical Sciences and Mathematics - Physics - Condensed Matter Physics |
| Principal Investigator: | Edson Sardella |
| Grantee: | Edson Sardella |
| Host Institution: | Faculdade de Ciências (FC). Universidade Estadual Paulista (UNESP). Campus de Bauru. Bauru , SP, Brazil |
| Associated researchers: | Rafael Zadorosny |
Abstract
The main goal of the present project is the study of mesoscopic superconductors with finite thickness. Due to the recent progress in fabrication techniques, it has become possible the manufacturing of superconducting electronic devices in the nanometric scale. Once the presence of external currents is of fundamental importance to the proper functioning of these devices, the study of superconductors driven by external currents has gained great importance in the literature. It is well known that in these configuration it is possible the formation of a resistive state, in which, above a critical current, superconductivity coexists with a voltage across the sample and phase slip lines (PSL's) or kinematic vortex are periodically formed. Due to the huge computational challenge that the solution of this problem represents, previous works make use of approximations, such as the negligence of the self-field induced by the supercurrents in the sample. In this way, the problem is reduced to a two-dimensional one and so, much more tractable one. It was recently shown, though, that both the supercurrents distribution and the self-field have an important role in the resistive state dynamics. This result put in question the commonly used approximations and renders further investigations worth of study. In the present project, we propose a solution to the full 3D problem, taking into consideration both the effects of the self-field and the demagnetization effects due to the finite size of the superconducting sample. In this scenario, we will be able to investigate, without any approximation, the self-field influence in the resistive state dynamics, in particular, to study the contributions of the non-transverse components of the self-field to this problem, a subject not yet fully explored. Concomitantly, the computational power this project aim will make possible the study of the resistive state in yet others scenarios, as multi-band superconductors, which gained enormous importance in last years due to the emergence of new multi-band superconducting compounds. Up to this moment, the resistive state of such materials was investigated only for the case of superconducting filaments. One of the goals of the present project is to extend this studies to the case of wide superconducting films, investigating the process of PSL's and kinematic vortex creation, a so yet unexplored phenomena. In addition, we aim to investigate in which manner the presence of a thermal gradient affects the resistive state. It is well known that thermal gradients acts on the vortex matter similarly to a pinning mechanism. Once such effect can be explored in superconducting devices, the investigation of the resistive state in this configuration reveals itself important and yet not explored. (AU)
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