Correlative Motion of Vortices near Vortex Lattice Melting Point in Bi2Sr2CaCu2O8+x Single Crystals

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Abstract
Voltage noise of the Bi2Sr2CaCu2O3+x single crystal below Tc is by an asymptotic power spectrum method. The low-frequency noise, power, Sa(T), shows a peak at Y = Tp. This peak is found to be closely related to the vortex lattice melting temperature. Near the peak T = Tp the power spectrum, Sa(f), exhibits a power-law fall-off, while at much lower temperatures Sa(f) dramaticaily deviates from the power-law behaviour, showing some broad peaks which are superposed upon a background with an exponential-law characteristic. The estimated correlation dimension of the noise data reveals that the vortex motion is highly correlatas at the early stage of melting, then develops into an extended dissipative dynamic system with self-organized criticality, showing a 1/fa behaviour. The correlated motion disappears when the lattice completely melts.
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Author(s)
Zhao, Yong
Zhang, Hua
Gu, Genda
Han, Shaowei
Russell, Graeme
Koshizuka, N
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Publication Year
1997
Resource Type
Journal Article
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UNSW Faculty