The magnetic relaxation of YBa2Cu3O7-δ, Ba1-xKxBiO3-δ, and Bi2Sr2CaCu2O8+δ has been measured between 10-4 sec to 104 sec. The corresponding lnV-lnI characteristics of YBa2Cu3O7-δ show significant negative curvature and collapse after scaling, strongly supporting the vortex glass model. However, Bi2Sr2CaCu2O8+δ seems to behave differently. In addition to that, far below the irreversibility line, the data suggest a new vortex-phase boundary.
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