Physics – Condensed Matter – Materials Science
Scientific paper
2008-12-19
Phys. Rev. B 79, 144304 (2009)
Physics
Condensed Matter
Materials Science
9 pages, 8 figures
Scientific paper
10.1103/PhysRevB.79.144304
Time-dependent speckle pattern of paraelectric barium titanate observed in a soft x-ray laser pump-probe measurement is theoretically investigated as a correlated optical response to the pump and probe pulses. The scattering probability is calculated based on a model with coupled soft x-ray photon and ferroelectric phonon mode. It is found that the speckle variation is related with the relaxation dynamics of ferroelectric clusters created by the pump pulse. Additionally, critical slowing down of cluster relaxation arises on decreasing temperature towards the paraelectric-ferroelectric transition temperature. Relation between critical slowing down, local dipole fluctuation and crystal structure are revealed by quantum Monte Carlo simulation.
Ji Kai
Namikawa Kazumichi
Nasu Keiichiro
Zheng Hang
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