Onset of dendritic flux avalanches in superconducting films

被引：106

作者：

Denisov, D. V.

Shantsev, D. V.

Galperin, Y. M.

Choi, Eun-Mi

Lee, Hyun-Sook

Lee, Sung-Ik

Bobyl, A. V.

Goa, P. E.

Olsen, A. A. F.

Johansen, T. H.

机构：

[1] Univ Oslo, Dept Phys, N-0316 Oslo, Norway

[2] Univ Oslo, Ctr Adv Mat & Nanotechnol, N-0316 Oslo, Norway

[3] AF Ioffe Phys Tech Inst, St Petersburg 194021, Russia

[4] Pohang Univ Sci & Technol, Dept Phys, Natl Creat Res Initiat Ctr Superconductiv, Pohang 790784, South Korea

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 97卷 / 07期

关键词：

D O I：

10.1103/PhysRevLett.97.077002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report a detailed comparison of experimental data and theoretical predictions for the dendritic flux instability, believed to be a generic behavior of type-II superconducting films. It is shown that a thermomagnetic model published very recently [Phys. Rev. B 73, 014512 (2006)] gives an excellent quantitative description of key features like the stability onset (first dendrite appearance) magnetic field, and how the onset field depends on both temperature and sample size. The measurements were made using magneto-optical imaging on a series of different strip-shaped samples of MgB2. Excellent agreement is also obtained by reanalyzing data previously published for Nb.

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页数：4

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