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

Author

Listed:
  • 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)

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

Suggested Citation

  • Jose Barba-Ortega & Miryam R. Joya & Edson Sardella, 2019. "Resistive state of a thin superconducting strip with an engineered central defect," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 92(7), pages 1-6, July.
    • Handle: RePEc:spr:eurphb:v:92:y:2019:i:7:d:10.1140_epjb_e2019-100082-y
    DOI: 10.1140/epjb/e2019-100082-y
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    Solid State and Materials;

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