Yu. Pogorelov | Searcharxiv

arXiv1995

Non linear dynamics of vortices in superconductors with short coherence length

In superconductors where the coherence length is comparable to the Fermi wavelength, the vortex viscosity depends on the velocity of the vortex, leading to non linear equations of motion. The trajectories of vortices driven by a. c. fields show a variety of behaviors as function of frequency. Finite pertubations give rise to very long lived transients. The relevance of these results to experiments in high-T$_{\rm c}$ superconductors is discussed.

cond-mat↗

arXiv1993

Flux flow dissipation in superconductors with short coherence length

In superconductors where the coherence length is comparable to the Fermi wavelength, the electronic levels within a vortex core are quantized, and separated by energies of the order of the superconducting gap. The absence of a continuum modifies significantly the energy dissipation due to the motion of vortices. At zero temperature, dissipation is suppressed, and the system shows non ohmic behavior. The I-V characteristics show two distinct regimes. Below a given electric field, I is strongly dependent on V. Flux flow resistivity also shows a marked dependence on temperature, and reaches conventional values near $T_c$.

cond-mat↗