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Non-Ergodic Behavior of Polarization Growth in the Quantum Relaxor K1-xLixTaO3
Hiroko Yokota,Yoshiaki Uesu 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.2I
The quantum paraelectric KTaO3 doped with 3 % Li is investigated by using a second harmonicgeneration microscope. A slow kinetics of the order parameter is observed under an electric field. At low temperatures below 30 K, the SH intensity doesn’t grow in the laboratory time while around 40 K, the SH intensity increases steeply within 10 minutes, followed by a slow increase toward the equilibrium value. The phenomenon is related to three types of domains with different speeds of domain growth. The applicability of the theory proposed by Alberici-Kious et al. is also discussed.'
Recent Progress of SHG Interference Microscope and Its Applications
Yoshiaki UESU,Hiroko YOKOTA,Noritaka Kato,Satoshi KAWADO 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.2I
A confocal second-harmonic-generation (SHG) interference microscope has newly been developed. The microscope enables us to obtain section images of 180 domain structures in ferroelectrics along the axial direction. SHG interference images of inverted domains in MgO:LiNbO3 are shown. The microscope is also equipped with a micro-Raman optical system, which gives SHG and Raman images at the same site of a specimen. An example for LiIO3/laponite nano-composites is shown.