Magnetic flux penetration into finite length thin-walled niobium cylinders

•Character of magnetic field in a finite length thin-walled cylinder is analyzes.•A model was proposed that explains the nature of giant jumps of magnetic flux in weak fields. The distribution of magnetic field in a finite thin-walled Nb superconducting cylinder in an axial magnetic field is analyze...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 2018-02, Vol.545, p.10-13
Main Authors: Tsindlekht, M.I., Genkin, V.M., Felner, I., Zeides, F., Katz, N., Gazi, Š., Chromik, Š., Kolăcek, J., Maryško, M.
Format: Article
Language:English
Subjects:
Current density
Cylinders
Density
Magnetic fields
Magnetic flux
Niobium
Superconductivity
Temperature dependence
Thick walls
Thin films
Wall thickness
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Summary:•Character of magnetic field in a finite length thin-walled cylinder is analyzes.•A model was proposed that explains the nature of giant jumps of magnetic flux in weak fields. The distribution of magnetic field in a finite thin-walled Nb superconducting cylinder in an axial magnetic field is analyzed. Both current density and magnetic field exhibit strong maximum in the cylinder edges. This triggers a giant flux jump in the hollow cylinder when a slowly increasing external magnetic field reaches a threshold value. Experimentally measured flux jumps were observed in a wide range of external fields, even below Hc1 of the Nb film. The field at which the jumps appear is temperature dependent. It was found that with increasing the wall thickness the singularity of the current density and magnetic field on the edges decreases, which explains the absence of giant jumps in a sample with thick walls in fields below Hc1.
ISSN:0921-4534
1873-2143
DOI:10.1016/j.physc.2017.10.014