Origin of dendritic flux patterns in MgB2 films

被引：67

作者：

Baziljevich, M

Bobyl, AV

Shantsev, DV

Altshuler, E

Johansen, TH

Lee, SI

机构：

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

[2] Univ Havana, Fac Phys, IMRE, Superconduct Lab, Havana, Cuba

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

来源：

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 2002年 / 369卷 / 1-4期

关键词：

dendritic flux penetration; thermo-magnetic origin; MgB2; film; MO imaging;

D O I：

10.1016/S0921-4534(01)01226-6

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The dendritic patterns of magnetic flux motion formed during field penetration into an MgB2 film were observed using mageto-optic imaging. To investigate the origin of the dendrites, experiments were performed where the sample was partially covered with an thermally conducting foil serving as an efficient heat sink. We observed that the dendrites are formed only in areas lacking the thermal conductor. When dendrites develop in the uncovered part they never invade into the covered region. The results strongly suggest that the dendritic instability is thermal in origin. (C) 2001 Published by Elsevier Science B.V.

引用

页码：93 / 96

页数：4

共 13 条

[1] Vortex avalanches and magnetic flux fragmentation in superconductors [J].