Pinning effects on hot-electron vortex flow instability in superconducting films

作者：Shklovskij Valerij A

来源：Physica C-Superconductivity and Its Applications, 2017, 538: 20-26.

DOI：10.1016/j.physc.2017.05.005

• Flux-flow instability
• Washboard potential
• Pinning
• Vortex dynamics
• Hot electrons

The hot-electron vortex flow instability in superconducting films in magnetic field B at substrate temperature T-0 << T-c is theoretically considered in the presence of pinning. The magnetic field dependences of the instability critical parameters (electric field E*, current density j*, resistivity rho*, power density P* and vortex velocity v*) are derived for a cosine and a saw-tooth washboard pinning potential and compared with the results obtained earlier by M. Kunchur [Phys. Rev. Lett. 89 (2002) 137005] in absence of pinning. It is shown that the B-behavior of E*, j* and rho* is monotonic, whereas the B-dependence of v* is quite different, namely dvdB may change its sign twice, as sometimes observed in experiments. The simplest heat balance equation for electrons in low-T-c superconducting films is considered within the framework of the two-fluid model.

• 出版日期2017-7-15