铁电体中极化长程涨落的光子关联谱实验研究

张明俊; 郭智; 邰仁忠; 张祥志; 罗豪甦

doi:10.7498/aps.64.147801

摘要

从极化团簇的随机涨落出发, 利用维纳过程模型, 推导了铁电体中极化长程涨落的弛豫规律以及光强自相关函数所可能的表现形式. 阐述了微观极化团簇的弛豫过程与宏观测量弛豫规律之间的联系. 通过对原有氦氖激光光子关联谱实验装置进行改进, 观测了BaTiO3和0.71Pb(Mg1/3Nb2/3)O3-0.29PbTiO3单晶中极化团簇长程涨落在居里点和立方到四方相变点附近的弛豫过程. 在BaTiO3中发现极化团簇长程涨落在居里点之上4 K存在双弛豫现象, 此现象与其有序无序相变机理相联系. 在Pb(Mg1/3Nb2/3)O3-0.29PbTiO3中发现极化团簇长程涨落在相变点两侧都存在双弛豫现象. 利用推导的理论结果很好地拟合了实验结果并提取了极化团簇长程涨落的弛豫时间. 两种样品中极化团簇长程涨落的弛豫时间都在相变点出现突变, 并呈现临界慢化现象.

关键词:

Abstract

Based 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 g2(τ) 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) O3-0.29PbTiO3 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 TC+4 K, which may be related to its order-disorder mechanism of phase transition. For 0.71Pb (Mg1/3Nb2/3) O3-0.29PbTiO3, 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, τs and τl corresponding to short and long relaxation time, respectively, are initially observed, where τs is several microseconds, and τl 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.

Keywords:

作者及机构信息

1.
中国科学院上海应用物理研究所, 上海 201204;

2.
中国科学院大学, 北京 100049;

3.
中国科学院上海硅酸盐研究所, 上海 200050

基金项目: 国家自然科学基金杰出青年基金(批准号: 11225527)、国家自然科学基金重点基金(批准号: 5133002)、国家重点基础研究发展计划(批准号: 2013CB632901)、上海市学术带头人项目(批准号: 13XD1404400)和国家自然科学基金青年基金(批准号: 110311005147)资助的课题.

Authors and contacts

1.
Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China;

2.
University of Chinese Academy of Sciences, Bejing 100049, China;

3.
Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China

Funds: Project supported by the National Natural Science Fund for Distinguished young Scholars of China (Grant No. 11225527), the Key Program of National Natural Science Foundation of China (Grant No. 5133002), the National key Basic Research Program of China (Grant No. 2013CB632901), the Shanghai Academic Leadership Program, China (Grant No. 13XD1404400), and the National Natural Science Foundation of China (Grant Nos. 110311005147).

参考文献

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[39]	Ji K, Namikawa K, Zheng H, Nasu K 2009 Phys. Rev. B 79 144304

施引文献

[1]	Pike E R, Abbiss J B 1997 Light Scattering and Photon Correlation Spectroscopy (Vol. 40) (Dordrecht: Kluwer Academic Publishers) pp65-67
[2]	Lin Y, Yang G C, Wang Y W 2013 Acta Phys. Sin. 62 118702 (in Chinese) [林瑜, 杨光参, 王艳伟 2013 物理学报 62 118702]
[3]	Liu X Y, Shen J, Zhu X J, Sun X M, Liu W 2012 Acta Opt. Sin. 32 0629002 (in Chinese) [刘晓艳, 申晋, 朱新军, 孙贤明, 刘伟 2012 光学学报 32 0629002]
[4]	Wang L N, Zhao X Y, Zhang L L, Huang Y N 2012 Chin. Phys. B 21 086403
[5]	Kleemann W, Licinio P, Woike T, Pankrath R 2001 Phys. Rev. Lett. 86 6014
[6]	Elissalde C, Ravez J 2001 J. Mater. Chem. 11 1957
[7]	Zhao J Y, Cui B, Chang Z G, Tang Z X 2008 Mater. Rev. 22 21 (in Chinese) [赵俊英, 崔斌, 畅柱国, 唐宗薰 2008 材料导报 22 21]
[8]	Chu R Q, Xu Z J, Li G R, Zeng H R, Yu H F, Shao X, Luo H S, Yin Q R 2005 Acta Phys. Sin. 54 935 (in Chinese) [初瑞清, 徐志军, 李国荣, 曾华荣, 余寒峰, 邵鑫, 罗豪甦, 殷庆瑞 2005 物理学报 54 935]
[9]	Cochran W 1960 Advan. Phys. 9 387
[10]	Harada J, Axe J D, Shirane G 1971 Phys. Rev. B 4 155
[11]	Vogt H, Sanjurjo J A, Rossbroich G 1982 Phys. Rev. B 26 5904
[12]	Presting H, Sanjurjo J A, Vogt H 1983 Phys. Rev. B 28 6097
[13]	Sokoloff J P, Chase L L, Rytz D 1988 Phys. Rev. B 38 597
[14]	Comes R, Lambert M, Guinier A 1968 Solid State Commun. 6 715
[15]	Zalar B, Laguta V V, Blinc R 2003 Phys. Rev. Lett. 90 037601
[16]	Zalar B, Levar A, Seliger J, Blinc R, Laguta V V, Itoh M 2005 Phys. Rev. B 71 064107
[17]	Ko J H, Kim T H, Roleder K, Rytz D, Kojima S 2011 Phys. Rev. B 84 094123
[18]	Yamada Y, Shirane G, Linz A 1969 Phys. Rev. 177 848
[19]	Tai R Z, Namikawa K, Sawada A, Kishimoto M, Tanaka M, Lu P, Nagashima K, Maruyama H, Ando M 2004 Phys. Rev. Lett. 93 087601
[20]	Namikawa K, Kishimoto M, Nasu K, Matsushita E, Tai R Z, Sukegawa K, Yamatani H, Hasegawa H, Nishikino M, Tanaka M, Nagashima K 2009 Phys. Rev. Lett. 103 197401
[21]	Yan R, Guo Z, Tai R, Xu H, Zhao X, Lin D, Li X, Luo H 2008 Appl. Phys. Lett. 93 192908
[22]	Zhang M J, Guo Z, Tai R Z, Luo H S, Namikawa K 2015 Jpn. J. Appl. Phys. 54 042401
[23]	Li F, Zhang S J, Li Z R, Xu Z 2012 Prog. Phys. 32 178 (in Chinese) [李飞, 张树君, 李振荣, 徐卓 2012 物理学进展 32 178]
[24]	Tyunina M, Levoska J 2001 Phys. Rev. B 63 224102
[25]	Smolenskii G A, Isupov V A, Agranovskaya A I, Popov S N 1961 Sov. Phys. Solid State 2 2584
[26]	Cross L E 1987 Ferroelectrics 76 241
[27]	Viehland D, Jang S J, Cross L E 1990 J. Appl. Phys. 68 2916
[28]	Pirc R, Blinc R 1999 Phys. Rev. B 60 13470
[29]	Ko J H, Kim D H, Tsukada S, Kojima S 2010 Phys. Rev. B 82 104110
[30]	Xu G, Wen J, Stock C, Gehring P M 2008 Nat. Mater. 7 562
[31]	Bovtun V, Petzelt J, Porokhonskyy V, Kamba S, Yakimenko Y 2001 J. Eur. Ceram. Soc. 21 1307
[32]	Tagantsev A K, Glazounov A E 1998 Phys. Rev. B 57 18
[33]	Lambert M, Comes R 1969 Solid State Commun. 7 305
[34]	Bokov A A, Ye Z G 2006 J. Mater. Sci. 41 31
[35]	Shamblin S L, Hancock B C, Dupuis Y, Pikal M J 1999 J. Pharm. Sci. 89 417
[36]	Apitz D, Johansen P M 2005 J. Appl. Phys. 97 063507
[37]	Maglione M, Böhmer R, Loidl A, Höchli U T 1989 Phys. Rev. B 40 11441
[38]	Hlinka J, Ostapchuk T, Nuzhnyy D, Petzelt J, Kuzel P, Kadlec C, Vanek P, Ponomareva I, Bellaiche L 2008 Phys. Rev. Lett. 101 167402
[39]	Ji K, Namikawa K, Zheng H, Nasu K 2009 Phys. Rev. B 79 144304

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