Giant flux jumps through a thin superconducting nb film in a vortex free region

M. I. Tsindlekht; V. M. Genkin; I. Felner; F. Zeides; N. Katz; Gazi; Chromik

doi:10.1016/j.physc.2016.08.005

Giant flux jumps through a thin superconducting nb film in a vortex free region

M. I. Tsindlekht^*, V. M. Genkin, I. Felner, F. Zeides, N. Katz, Gazi, Chromik

^*Corresponding author for this work

Racah Institute of Physics

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

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
Pages (from-to)	1-7
Number of pages	7
Journal	Physica C: Superconductivity and its Applications
Volume	529
DOIs	https://doi.org/10.1016/j.physc.2016.08.005
State	Published - 15 Oct 2016

Bibliographical note

Publisher Copyright:
© 2016 Elsevier B.V.

Keywords

Flux jumps
Superconductivity
Thin-walled cylinders

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10.1016/j.physc.2016.08.005

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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.",

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AU - Tsindlekht, M. I.

AU - Genkin, V. M.

AU - Felner, I.

AU - Zeides, F.

AU - Katz, N.

AU - Gazi,

AU - Chromik,

PY - 2016/10/15

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N2 - 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.

AB - 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.

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Giant flux jumps through a thin superconducting nb film in a vortex free region

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Keywords

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