科研之友
微信
新浪微博
Facebook
分享链接
摘要
Dynamics of vortices in planar pinning centers with thermal fluctuations were considered based on a Fokker-Planck equation, and anisotropic behavior of current-voltage characteristics were investigated. Because of the guided motion of vortices in planar pinning centers, both the longitudinal electric field E-parallel to (parallel to the transport current density J) and the transverse electric field E-perpendicular to (perpendicular to J) depend strongly on the direction of J. When a driving force due to the current is tilted away from the pinning planes, the direction of vortex motion depends on both the magnitude of J and the strength of the pinning effects. Such a change in the direction of vortex motion brings about two striking features of the J dependence of E-parallel to and E-perpendicular to: (i) the dependence of E-perpendicular to upon J can have a peak and (ii) under certain circumstances, the generation of E-parallel to or E-perpendicular to can be enhanced by the pinning effects. [S0163-1829(99)02817-9].
- 出版日期1999-5-1
