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

Abstract

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 T0. The FFI critical parameters, namely the current density j*, the electric field E*, the power density P*, and the vortex 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.

Source-reported materials — not catalogue approval

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