Phys. Rev. Lett. 103, 197401 (2009) [4 pages]Direct Observation of the Critical Relaxation of Polarization Clusters in BaTiO3 Using a Pulsed X-Ray Laser Technique
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 (TC) was investigated. The maximum relaxation time (∼90 ps) is shown to appear at a temperature of 4.5 K above the TC, 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. This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.103.197401
DOI:
10.1103/PhysRevLett.103.197401
PACS:
78.70.Ck, 61.05.cf, 77.80.Bh, 77.84.Dy
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