Flux avalanche in thin superconducting film with internal crack

• 来源期刊: 中国科学:物理学 力学 天文学（英文版）
• 年，卷（期）: 2018,（9）
• 页码范围: 103-106
• 页数: 4页
• 语种: 英文

摘要

When type-Ⅱ superconductors are in external magnetic field,the magnetic flux would penetrate the superconductors in the form of flux vortex [1].If the superconductor is subjected to a local thermal disturbance,this may trigger a surge of flux vortices into the superconductor,which would lead to thermomagnetic instabilities,such as flux jump and flux avalanche [2].At a lower environment temperature,a flux avalanche is one of the key factors preventing widespread application of superconducting electronic devices [3].Bolz et al.[4] found that the propagation speed of a flux avalanche can reach hundreds of kilometers per second.Furthermore,a flux avalanche can cause a great jump of the magnetic field and temperature of a superconducting film [5],thus,the maximum temperature in the superconductors can easily exceed the critical temperature [6].