Abstract
The problem of Abrikosov vortices depinning from extended linear (columnar) defect in 3D-anisotropic superconductor film under non-uniformly distributed Lorentz force is studied for the case of low temperatures, disregarding thermal activation processes. We treat it as a problem of mechanical behavior of an elastic vortex string settled in a potential well of a linear defect and exerted to Lorentz force action within the screening layer about the London penetration depth near the specimen surface. The stability problem for the vortex pinning state is investigated by means of numerical modeling, and conditions for the instability threshold are obtained as well as the critical current density \(j_\mathrm{c}\) and its dependence on the film thickness and magnetic field orientation. The instability leading to vortex depinning from extended linear defect first emerges near the surface and then propagates inside the superconductor. This scenario of vortex depinning mechanism at low temperatures is strongly supported by some recent experiments on high-Tc superconductors and other novel superconducting materials, containing columnar defects of various nature.
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Acknowledgements
This work was supported in part by the Russian Foundation for Basic Research (Projects No. 17-01-00973-a and No. 15-07-06082-a). The authors thank A. Drugov for some computing
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Fedirko, V.A., Kasatkin, A.L. & Polyakov, S.V. Vortex Escape from Columnar Defect in a Current-Loaded Superconductor. J Low Temp Phys 192, 359–374 (2018). https://doi.org/10.1007/s10909-018-1986-0
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DOI: https://doi.org/10.1007/s10909-018-1986-0