Abstract
We have studied the dynamical motion of Josephson vortices (JVs) in the Josephson junctions, using high Tc superconductor (HTSC) Bi2Sr2CaCu2O8+y, which have intrinsically stacked Josephson junctions (IJJs), As we have observed periodical oscillations in the flow resistance of JVs against parallel magnetic field to the superconducting layers, we have introduced pancake vortices to control the motion of JVs, which have a role for pinning of JVs. Applying a time-asymmetric input current with biharmonics, we have observed a reversible "ratchet" effect with changing the phase and the frequency difference in the biharmonics. The output signal is much larger than that using the single JJ. Utilizing a multiple-function of IJJs, new types of the junctions will open the new functional devices of HTSCs.
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