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Study of mesoscopic superconducting systems


On the last decades the development of nanofabrication techniques allowed the production and an intense investigation of the vortex dynamics and the properties of mesoscopic and structured superconductors. These systems exhibit a variety of exotic behaviors and due to this and other aspects they have been studied both experimental and theoretically. The present work focuses on the study of the vortex dynamics using the time dependent Ginzburg-Landau equations, TDGL, in computational simulations of superconducting systems of meso and macroscopic sizes and with the insertion of structures of defects. Such technique allows us to visualize both the steady configurations of the vortices and the evolution of these entities in a non-equilibrium state, i.e., the range between two steady states. Thus, we will follow the evolution of the system controlling the thermodynamics variables such as the temperature and the external magnetic field and we will analyze the vortex dynamics in the presence of defects. We will also use the TDGL equations to study the possible current crowding effects which could occur in those systems and relate them with both the morphology of the dendritic penetrations and with a possible ratchet effect that appear when a transport current is applied in the presence of a magnetic field. It is worth to note that our interest in these studies has a fundamental character, focused on the comprehension of the mechanisms of the magnetic response of systems where defects act as pinning centers and as the presence of such centers affects the vortex dynamics in the material. However, the implications of such studies should be extended to the branch of applications due to the crucial role played by current crowding effects and by interactions between vortex and pinning centers in limiting the critical current of superconductors. (AU)

Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
OKIMOTO, D.; SARDELLA, E.; ZADOROSNY, R. Profile and Crowding of Currents in Mesoscopic Superconductors With an Array of Antidots. IEEE Transactions on Applied Superconductivity, v. 25, n. 3 JUN 2015. Web of Science Citations: 0.

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