Abstract
We consider magnetic flux moving in superconductors with periodic pinning arrays. We show that sample heating by moving vortices produces negative differential resistivity (NDR) of both and type (i.e., - and -shaped) in the voltage-current characteristic ( curve). The uniform flux flow state is unstable in the NDR region of the curve. Domain structures appear during the NDR part of the curve of an type, while a filamentary instability is observed for the NDR of an type. The simultaneous existence of the NDR of both types gives rise to the appearance of striking self-organized (both stationary and nonstationary) two-dimensional dynamical structures.
- Received 26 June 2005
DOI:https://doi.org/10.1103/PhysRevLett.96.127004
©2006 American Physical Society