Probing the Vorticity in a Superconductor Rapidly Quenched from the Normal State |
| |
Authors: | F Boyer F Chibane and J-P Maneval |
| |
Affiliation: | (1) Laboratoire de Physique LPMC (CNRS), Ecole Normale, 24 rue Lhomond, 75231 Paris, France;(2) Faculté des Sciences, Université d'Agadir, Agadir, Maroc;(3) Université Paris 7, Paris, France |
| |
Abstract: | Topological defects such as vortices subsist for some time in a rapidly frozen superconducting film (W. H. Zurek, Phys. Rep.
276, 177, 1996). We propose to use as a probe of the vortex density the finite delay T
d, which, in narrow strips, exists between a current step and the voltage response. Technically, this amounts to driving a bridge into the localized hot-spot regime by means of a pump pulse (laser or electrical). Cooling of such films as epitaxial YBCO-on-MgO, or niobium-on-sapphire, requires only a few nanoseconds at low T. A time t later, a probe pulse is applied to measure T
d. The dependence t T
d is interpreted as a witness of the fossil vorticity, long after quenching into the zero-resistance regime. |
| |
Keywords: | nonequilibrium superconductivity weak links high-T
c films spontaneous breaking of gauge symmetries |
本文献已被 SpringerLink 等数据库收录! |
|