Vortex motion in an organic superconductor κ-(BEDT-TTF)2Cu(SCN)2

Dynamical Properties of vortices introduced into a crystal of κ-(BEDT-TTF)2Cu(SCN)2 by a dc magnetic field were investigated through the shielding effect against an rf (1.5MHz) magnetic field applied parallel to the 2D plane. We found that the behavior of vortices changes with the change of the rf-frequency. When the dc field is applied in a direction slightly tilted from the 2D plane, rf shielding becomes much stronger than in zero field, indicating that the rf field is blocked by the presence of the vortices.