Magnetic flux penetration into finite length thin-walled niobium cylinders

0501159 - FZÚ 2019 RIV NL eng J - Journal Article
Tsindlekht, M.I. - Genkin, V.M. - Felner, I. - Zeides, F. - Katz, N. - Gazi, Š. - Chromik, Š. - Koláček, Jan - Maryško, Miroslav
Magnetic flux penetration into finite length thin-walled niobium cylinders.
Physica. C. Roč. 545, Feb (2018), s. 10-13. ISSN 0921-4534. E-ISSN 1873-2143
Institutional support: RVO:68378271
Keywords : vortex avalanches * superconductors
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 0.985, year: 2018

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 H c 1 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.
Permanent Link: http://hdl.handle.net/11104/0293149