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Very sensitive responses to external forces are found near phase transitions.However, phase transition dynamics and pre-equilibrium phenomena are difficultto detect and control. We have directly observed that the equilibrium domainstructure following a phase transition in BaTiO3, a ferroelectric andferroelastic material, is attained by halving of the domain periodicity,sequentially and multiple times. The process is reversible, displayingperiodicity doubling as temperature is increased. This observation is backedtheoretically and can explain the fingerprints of domain period multiplicityobserved in other systems, strongly suggesting this as a general model forpattern formation during phase transitions in ferroelastic materials.

Periodicity doubling cascades: direct observation in ferroelastic materials