Pinning effects on self-heating and flux-flow instability in superconducting films near Tc

Valerij A. Shklovskij, Anastasiia P. Nazipova, Oleksandr V. Dobrovolskiy
2017 Physical review B  
The effect of pinning on self-heating triggering the Larkin-Ovchinnikov (LO) flux-flow instability (FFI) in superconducting thin films is theoretically investigated. The problem is considered relying upon the Bezuglyj-Shklovskij (BS) generalization of the LO theory, accounting for a finite heat removal from the quasiparticles at temperature T^∗ to the bath at temperature T_0. The FFI critical parameters, namely the current density j^∗, the electric field E^∗, the power density P^∗, and the
more » ... x velocity v^∗ are calculated and graphically analyzed as functions of the magnetic field and the pinning strength. With increasing pinning strength at a fixed magnetic field value E^∗ decreases, j^∗ increases, while P^∗ and T^∗ remain practically constant. Vortex pinning may hence be the cause for eventual discrepancies between experiments on superconductors with strong pinning and the generalized LO and BS results.
doi:10.1103/physrevb.95.184517 fatcat:vfu25y5horfmbfcjzjox56n3im