Motion of current-driven vortex solids in the Corbino-disk of amorphous superconducting films
摘要:
We study the dynamic properties of the vortex-solid driven by a radial current I in the Corbino-disk (CD) of a thick amorphous a-MoxSi1-x film With moderately strong pinning and a thick a-Mo-x,Gel(1-x) film with weaker pinning. In CID, vortices rotate around the center of the sample by feeling a Lorentz force f(L) inversely proportional to the radius r of rotation. We measure the voltages, V(r(12)) and V(r(23)) induced at the two voltage probes placed radially (r(12) < r(23)), as a function of f(L) (or I). For both films the initial dynamic state of driven solid is the plastic flow, indicating significant pinning effects. For the a-MoxSi1-x film the large difference between V(r, 2) and V(r23) is observed at lowest 1, which is attributed to the stronger pinning effects in the a-MoxSi1-x film. (c) 2007 Elsevier B.V. All rights reserved.