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(a) Dielectric permittivity for the single crystal measured by an Agilent E4991A resistance analyzer. (b) Microscopic images of the single crystal taken by an optical polarization microscope. Clear domains stripes could be found below the Curie temperature at . Above , the domain stripes disappeared, leaving only some black spots that are inherent nicks on the surface possibly caused by polishing.
Top view of the experiment setup. Vertically polarized photons illuminate the sample. Those photons which scatter from the sample with horizontal polarization were collected as the signal, which was then fed into two detectors (PMTs) via a beam splitter. The temporal correlation was performed by a correlator.
Temporal correlation spectrum of polarization clusters in at various temperatures. The integration time of each measurement was . All the red solid curves are fits to the KWW function except for that at , where the apparent correlation disappeared and the adjacent averaging smoothing curve was given. The arrows label the positions of relaxation time at different temperatures.
Temperature dependence of the characteristic relaxation time for polarization clusters in . The error bars show the statistical confidence interval around the mean from the least-square fittings by KWW functions as drawn in Fig. 3. The solid line is fitted by Arrhenius equation. As a reference the mean scattering intensity is also included as the open squares show. The dashed line was a guide to the eyes.
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