Resistive state of a thin superconducting strip with an engineered central defect

Made available in DSpace on 2019-10-04T12:39:09Z (GMT). No. of bitstreams: 0 Previous issue date: 2019-07-01 We study the resistive state of a mesoscopic superconducting strip with an engineered defect at the center. The defect is another superconductor with a different critical temperature. Several geometrical shapes of the defect are studied. The strip is considered under a transport electrical current, J(a), and at zero external applied magnetic field. The current is applied through a metallic contact, and the defect is simulated with the phenomenological parameter (T) = (0)(T - T-c(r)) in the Ginzburg-Landau free energy density. Here T-c(r) = T-c,T-0 + T(r), where T(r) < 0 (T(r) > 0) corresponds to a domain of lower (higher) critical temperature. It is shown that the critical current density for the I-V characteristic curve, J(c1), at which the first vortex-antivortex (V-Av) pair nucleates in the sample, as well as its dynamics, strongly depend on the critical temperature, the position, and the geometry of the defect. Univ Nacl Colombia, Dept Fis, Bogota, Colombia Univ Estadual Paulista, Dept Fis, Fac Ciencias, Caixa Postal 473, BR-17033360 Bauru, SP, Brazil Univ Estadual Paulista, Dept Fis, Fac Ciencias, Caixa Postal 473, BR-17033360 Bauru, SP, Brazil