Abstract
The relative flux creep rate S( t)≡d ln M/d ln t of a single crystal of Ba 1− x K x BiO 3−δ(BKBO) was measured up to a few degrees Kelvin below the irreversibility line. It is nearly constant at low temperatures but rises sharply after a threshold temperature T t . Above T t , the creep changes from logarithmic to non-logarithmic decay. All these are very similar to those observed in Y 1Ba 2Cu 3O 7−δ (YBCO) samples and suggest a flux-lattice phase sub-boundary. The ratio between the boundary field B t and the irreversibility field B i falls between 0.15 and 0.25 for both BKBO and YBCO at various temperatures, implying a possible close relationship between the boundary and the irreversibility line.
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