Direct observation of the critical relaxation of polarization clusters in BaTiO3 using a pulsed x-ray laser technique.
Direct observation of the critical relaxation of polarization clusters in BaTiO3 using a pulsed x-ray laser technique.
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DOI：
10.1103/physrevlett.103.197401
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发表时间：
2009-11
影响因子：
8.6
通讯作者：
K. Namikawa;M. Kishimoto;K. Nasu;E. Matsushita;R. Tai;K. Sukegawa;H. Yamatani;H. Hasegawa;M. Nishikino;M. Tanaka;K. Nagashima
中科院分区：
文献类型：
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作者：
K. Namikawa;M. Kishimoto;K. Nasu;E. Matsushita;R. Tai;K. Sukegawa;H. Yamatani;H. Hasegawa;M. Nishikino;M. Tanaka;K. Nagashima
我们发展了一种新的方法来研究BaTiO_3极化团簇中偶极矩的驰豫时间。利用双脉冲软X射线激光测量了散斑强度的时间相关性。研究了居里温度(T(C))附近偶极矩弛豫时间的演化。最大驰豫时间(约90ps)出现在温度T(C)以上的4.5K，这与最大极化发生的温度一致。这种方法广泛适用于任何其他相变的临界衰变过程。
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 (approximately 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.