Abstract
Investigations have been carried out on history dependences within the driven vortex solid state of YBa 2Cu 3O 7-δ single crystals. It has been demonstrated that the driven system has the tendency to stabilise in two particular dynamic phases: one ordered, the other relatively disordered. Transient responses observed on switching between drive modulation forms were interpreted in terms of changeovers between these phases. An unusual oscillatory response, arising on application of an asymmetric drive, has been explained in terms of distinct regions of such phases coexisting within the sample, their relative proportions changing periodically with time. Specifically, it has been demonstrated that the ordered dynamic state is inherently stable, in that it is easier to coherently drive an ordered-phase domain out of the sample than it is to break it apart.
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