We identify a new regime of decay of the irreversible magnetization in clean
Bi2​Sr2​CaCu2​O8​ crystals, at induction values close to the
``second peak field'' at which the bulk critical current density steeply
increases. A time window is identified during which the decay of the induction
is controlled by the slow propagation of the phase transformation front across
the sample.Comment: 2 pages, 3 figures Paper submitted to the conference proceedings of
M2S-2000 Houston T