Direct Observation of the Critical Relaxation of Polarization Clusters in BaTiO 3 Using a Pulsed X-Ray Laser Technique
2009; American Physical Society; Volume: 103; Issue: 19 Linguagem: Inglês
10.1103/physrevlett.103.197401
ISSN1092-0145
AutoresK. Namikawa, Maki Kishimoto, Keiichirō Nasu, E. Matsushita, Renzhong Tai, K. Sukegawa, Hiroshi Yamatani, Hiroshi Hasegawa, Masaharu Nishikino, Momoko Tanaka, Keisuke Nagashima,
Tópico(s)Electronic and Structural Properties of Oxides
ResumoWe 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.
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