Abstract
We measure the dynamics of magnetic field penetration into thin-walled superconducting niobium cylinders. It is shown that magnetic field penetrates through the wall of a cylinder in a series of giant jumps with amplitude 1 - 2 mT and duration of less than a microsecond in a wide range of magnetic fields, including the vortex free region. Surprisingly, the jumps take place when the total current in the wall, not the current density, exceeds a critical value. In addition, there are small jumps and/or smooth penetration, but their contribution reaches only ≃ 20 % of the total penetrating flux. The number of jumps decreases with increased temperature. Thermomagnetic instabilities cannot explain the experimental observations.
Original language | English |
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Pages (from-to) | 1-7 |
Number of pages | 7 |
Journal | Physica C: Superconductivity and its Applications |
Volume | 529 |
DOIs | |
State | Published - 15 Oct 2016 |
Bibliographical note
Publisher Copyright:© 2016 Elsevier B.V.
Keywords
- Flux jumps
- Superconductivity
- Thin-walled cylinders