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Experimental study of photon correlation spectroscopy for the long-range fluctuation of polarization in ferroelectrics
Zhang, MJ; Guo, Z; Tai, RZ; Zhang, XZ; Luo, HS; Guo, Z (reprint author), Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201204, Peoples R China.
2015
Source PublicationACTA PHYSICA SINICA
ISSN1000-3290
Volume64Issue:14Pages:
Subtype期刊文献
AbstractBased on the theory of random fluctuation of polarization clusters and the model of Wiener random process, the relaxation law of long-range fluctuation of polarization and the possible forms of light intensity autocorrelation function g(2) (tau) measured from photon correlation spectroscopy (PCS) experiments have been derived. The relationship between relaxation mechanisms of microscopic polarization clusters and macro relaxation laws is expounded. This research supplies a theoretical model for the application of PCS in researching the relaxation process of polarization clusters in ferroelectrics. Based on the improved He-Ne laser PCS experimental set-up, the relaxation process of long-range fluctuation of polarization clusters in BaTiO3 and 0.71Pb (Mg1/3Nb2/3) O-3-0.29PbTiO(3) single crystals near phase transition temperature is studied. As for BaTiO3, the dual relaxation processes of long-range fluctuation of polarization clusters are observed at temperatures above T-C+4 K, which may be related to its order-disorder mechanism of phase transition. For 0.71Pb (Mg1/3Nb2/3) O-3-0.29PbTiO(3), the dual relaxation processes exist on both sides of the cubic-tetragonal phase transition temperature. The PCS experimental results are fitted well by the derived theoretical model, and the characteristic relaxation times of long-range fluctuation of polarization clusters are extracted. Two relaxation times, tau(s) and tau(l) corresponding to short and long relaxation time, respectively, are initially observed, where tau(s) is several microseconds, and tau(l) is tens of microseconds. The abrupt increase of relaxation times at phase transition temperature and the phenomenon of critical slowing down can be observed in the two samples.
KeywordRelaxor Ferroelectrics Cubic Batio3 Neutron-scattering Light-scattering Chain Structure Knbo3 Phase Mode
Indexed BySCI
Language英语
WOS IDWOS:000362976400042
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/24925
Collection中科院上海应用物理研究所2011-2018年
Corresponding AuthorGuo, Z (reprint author), Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201204, Peoples R China.
Recommended Citation
GB/T 7714
Zhang, MJ,Guo, Z,Tai, RZ,et al. Experimental study of photon correlation spectroscopy for the long-range fluctuation of polarization in ferroelectrics[J]. ACTA PHYSICA SINICA,2015,64(14):—.
APA Zhang, MJ,Guo, Z,Tai, RZ,Zhang, XZ,Luo, HS,&Guo, Z .(2015).Experimental study of photon correlation spectroscopy for the long-range fluctuation of polarization in ferroelectrics.ACTA PHYSICA SINICA,64(14),—.
MLA Zhang, MJ,et al."Experimental study of photon correlation spectroscopy for the long-range fluctuation of polarization in ferroelectrics".ACTA PHYSICA SINICA 64.14(2015):—.
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