Abstract
The time decay of the zero field cooled diamagnetic magnetization of Bi2Sr2CaCu2O8 single crystals can be explained in terms of a characteristic relaxation time τ0 and a mean activation energy E which is proportional to the reciprocal magnetic field. We find that τ0 becomes extremely long to be around 10 s at low temperatures below 14 K. This low temperature phase in the vortex solid region is also directly confirmed by the ac susceptibility measurements in the ultra low frequency range.
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