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The field-driven conversion between the zero-field-cooled frozen relaxorstate and a ferroelectric state of several cubic relaxors is found to occur inat least two distinct steps, after a period of creep, as a function of time.The relaxation of this state back to a relaxor state under warming in zerofield also occurs via two or more sharp steps, in contrast to a one-steprelaxation of the ferroelectric state formed by field-cooling. An intermediatestate can be trapped by interrupting the polarization. Giant pyroelectric noiseappears in some of the non-equilibrium regimes. It is suggested that twocoupled types of order, one ferroelectric and the other glassy, may be requiredto account for these data.Comment: 27 pages with 8 figures to appear in Phys. Rev.

Two-step phase changes in cubic relaxor ferroelectrics