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Study of size effects in critical currents and dynamical behavior of vortices in type ii superconducting strips with periodic pinning at finite temperature.

Grant number: 12/22141-2
Support Opportunities:Scholarships in Brazil - Master
Effective date (Start): March 01, 2013
Effective date (End): February 28, 2015
Field of knowledge:Engineering - Materials and Metallurgical Engineering
Principal Investigator:Pablo Antonio Venegas Urenda
Grantee:Lucas Garcia Verga
Host Institution: Faculdade de Ciências (FC). Universidade Estadual Paulista (UNESP). Campus de Bauru. Bauru , SP, Brazil


In the present work we propose the study of critical currents and dynamical behavior of vortices in type II Superconducting stripes with Kagomé and hexagonal arrays of pinning centers. In addition to the finite geometry and pinning effects, the system behavior when external parameters such as temperature and magnetic field are changed will be analyzed. When the transport current J exceeds a critical value, the vortices starts to move and dissipate energy. One of the most important mechanisms used to increase the critical current in type II superconductors is the vortex pinning. A great experimental effort has been made to increase the pinning effects creating structural defects. However, the pinning mechanism has not been completely understood, and theoretical studies could help to comprehend the pinning influence in critical currents and dynamical behavior. Our system corresponds to a bi-dimensional superconductor, finite in transversal and infinite in longitudinal direction. The description of the vortex system is made using a set of Langevin equations, and the Molecular Dynamics Technique is used to simulate the vortex dynamics. The solution of these equations will provide the vortex trajectories and velocities. With the trajectories is possible to characterize the dynamical phases and with the velocities the value of critical current. Others physical quantities as differential resistance, transversal diffusion coefficient and structure factor will be calculated to obtain a better characterization of the system dynamics. A detailed comparison with infinite superconducting thin films with Kagomé and hexagonal pinning arrays will be made, helping to achieve a better understanding of the size effects. The understanding of pinning mechanism and size effects at finite temperature is important because provides a better description of superconductors used in real applications. Moreover, the development of this project could help in the discovery of new superconducting materials with higher efficiency for technological uses. (AU)

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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)
VIZARIM, NICOLAS P.; CARLONE, MAICON; VERGA, LUCAS G.; VENEGAS, PABLO A.. Commensurability effects in the critical forces of a superconducting film with Kagome pinning array at submatching fields. European Physical Journal B, v. 90, n. 9, . (12/22141-2)
VERGA, L. G.; VIZARIM, N. P.; CARLONE, M.; VENEGAS, P. A.. Vortex Dynamic Phases in Type II Superconducting Strips with Regular and Flattened Triangular Pinning Arrays. Journal of Superconductivity and Novel Magnetism, v. 32, n. 5, p. 1179-1190, . (12/22141-2, 17/20976-3)
VIZARIM, NICOLAS PORTO; CARLONE, MAICON; VERGA, LUCAS GARCIA; VENEGAS, PABLO ANTONIO. Critical Forces at Fractional Matching Fields in Superconducting Thin Films with Triangular Pinning Lattice. MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS, v. 20, n. 4, p. 899-903, . (12/22141-2)
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
VERGA, Lucas Garcia. Estudo dos efeitos do tamanho e comensurabilidade nas correntes críticas em fitas supercondutoras do tipo II com redes periódicas de pinnings à temperatura finita. 2015. Master's Dissertation - Universidade Estadual Paulista (Unesp). Faculdade de Ciências. Bauru Bauru.

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