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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Kinematic vortices induced by defects in gapless superconductors

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Souto, V. S. [1] ; Duarte, E. C. S. [1] ; Sardella, E. [2] ; Zadorosny, R. [1]
Total Authors: 4
[1] Univ Estadual Paulista, UNESP, Dept Fis & Quim, Caixa Postal 31, BR-15385000 Ilha Solteira, SP - Brazil
[2] Univ Estadual Paulista, UNESP, Fac Ciencias Bauru, Dept Fis, Caixa Postal 473, BR-17033360 Bauru, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Physics Letters A; v. 419, DEC 17 2021.
Web of Science Citations: 0

The generalized time-dependent Ginzburg-Landau (GTDGL) theory was first proposed to describe better gap superconductors and the phenomenon of thermal phase-slips (PSs) in defect-free systems. However, there is a lack of information about studies involving PSs in mesoscopic superconductors with surface defects. Thus, in this work, we simulated samples with two co-linear surface defects consisting of a lower T-c superconductor narrowing the sample in its central part. The non-linear GTDGL equations were solved self-consistently under variable applied currents and by considering both gapless and gap-like superconductors. In such systems, the currents passing by the constriction induce the appearance of kinematic vortices even in the gapless sample. The dynamics always occur with a pair forming at opposite edges of the sample and annihilating in the center. It is noticed that the resistive state appears at distinct values of the applied current density for different samples, and the critical current presents a tiny difference between gapless and gap-like samples. It is worth mentioning that parameters such as the sizes of electrical contacts and constriction affect the critical current and the average velocity of the kinematic vortices. (C) 2021 Elsevier B.V. All rights reserved. (AU)

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
FAPESP's process: 16/12390-6 - Macro and mesoscopic superconductivity: synthesis of ceramic materials and computational simulations based on the TDGL theory
Grantee:Rafael Zadorosny
Support Opportunities: Regular Research Grants