Abstract
We investigate the static and dynamic behavior of vortices in a pin-free superconductor. A diffraction pattern is observed in the critical currentJ cvs. applied fieldH ∥parallel to the surface of a granular Al film. When one vortex chain is formed in the film,J cbecomes nearly equal to zero, which verifies that the sample is actually pin-free. An interaction between a radiofrequency current and moving vortices occurs, and theI–V curve shows peculiar nonlinear effects such as “real negative resistance.” The results are analogous to dc and ac Josephson effects.
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