Abstract
Voltage noise of Bi2Sr2CaCu2O8+x single crystal below TC is analyzed with an asymptotic power spectrum method. Low frequency noise power Sv(T) shows a peak at T=Tp. Above Tp, Sv(f) exhibits a power-law fall-off, but an exponential-law decay at T<Tp, qualitatively consistent with numerical simulation. It is suggested that the pinned vortex state is a deterministic motion with low-dimensional chaotic attractors while the unpinned state is an extended dissipative dynamic system with self-organized criticality.
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