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

Jose Barba-Ortega (), Miryam R. Joya and Edson Sardella
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Jose Barba-Ortega: Departamento de Física, Universidad Nacional de Colombia
Miryam R. Joya: Departamento de Física, Universidad Nacional de Colombia
Edson Sardella: Departamento de Física, Universidade Estadual Paulista, Faculdade de Ciências

The European Physical Journal B: Condensed Matter and Complex Systems, 2019, vol. 92, issue 7, 1-6

Abstract: Abstract 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, Ja, and at zero external applied magnetic field. The current is applied through a metallic contact, and the defect is simulated with the phenomenological parameter α(T) = α0(T − Tc(r)) in the Ginzburg-Landau free energy density. Here Tc(r) = Tc,0 + δT(r), where δT(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, Jc1, 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. Graphical abstract

Keywords: Solid; State; and; Materials (search for similar items in EconPapers)
Date: 2019
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DOI: 10.1140/epjb/e2019-100082-y

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