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- W4386043334 abstract "Magnetic vortices resemble bowstrings stretched across a corner at the initial stage of their penetration into a flat superconducting sample of a rectangular cross-section. As the external magnetic field $H_e$ reaches the threshold level $H_{th}$, a bowstring is released and instantaneously contracted in length with a substantial heat generation. This heat can serve as a trigger for nucleation of a flux instability (avalanche). At $H_e approx sqrt{2}H_{th}$ a usual vortex penetration starts at flat edges, and the bowstring mechanism is no longer effective. We describe the geometry of bowstring-like vortices, find $H_{th}$ for disk and strip shaped superconductors as a function of their thickness to width ratio, and determine the heat effect related to a bowstring release. Our results enable a novel treatment of numerous experimental data on flux instabilities and avalanche type penetration in flat superconducting samples. A moderate anisotropy of a superconducting penetration depth ($lambda_c > lambda_{ab}$) diminishes or even completely removes the bowstring effect. This explains the absence of spontaneous instabilities in epitaxial $mathrm{YBa}_{2}mathrm{Cu}_{3}mathrm{O}_{7-delta }$ films at all temperatures and in $mathrm{MgB_{2}}$ above 10 K." @default.
- W4386043334 created "2023-08-22" @default.
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- W4386043334 date "2023-08-17" @default.
- W4386043334 modified "2023-09-25" @default.
- W4386043334 title "Bowstring effect as a trigger for flux instabilities in thin superconductors" @default.
- W4386043334 doi "https://doi.org/10.48550/arxiv.2308.09136" @default.
- W4386043334 hasPublicationYear "2023" @default.
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