Journal
PHYSICAL REVIEW LETTERS
Volume 103, Issue 19, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.103.197401
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We have developed a new method to investigate the relaxation time of the dipole moment in polarization clusters in BaTiO3. Time correlation of speckle intensities was measured by the use of a double pulsed soft x-ray laser. The evolution of the relaxation time of the dipole moment near the Curie temperature (T-C) was investigated. The maximum relaxation time (similar to 90 ps) is shown to appear at a temperature of 4.5 K above the T-C, being coincident with the one where the maximum polarization takes place. This method is widely applicable to any other critical decay processes at phase transitions.
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