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We have carried out a high-resolution x-ray scattering study of the first-order paraelectric (PE) to ferroelectric (FE) transition of BaTi03. Using a pulsed electric field to cross the PE-FE phase boundary, both the x-ray scattering and bulk polarisation associated with the equilibrium FE phase appear only after a well defined delay relative to the pulse onset. Subsequently, the polarisation evolves much more rapidly than the x-ray intensity.

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