Avalanche dynamics of ferroelectric phase transitions in BaTiO3 and 0.7Pb( Mg2/3Nb1/3)O3-0.3PbTiO3 single crystals

被引：12
|
作者：
Xu, Yangyang [1 ]
Xue, Dezhen [1 ]
Zhou, Yumei [1 ]
Su, Tong [1 ]
Ding, Xiangdong [1 ]
Sun, Jun [1 ]
Salje, E. K. H. [1 ,2 ]
机构：
[1] Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China
[2] Univ Cambridge, Dept Earth Sci, Downing St, Cambridge CB2 3EQ, England
来源：
APPLIED PHYSICS LETTERS | 2019年 / 115卷 / 02期
基金：
英国工程与自然科学研究理事会;
关键词：
POWER-LAW DISTRIBUTIONS; CRACKLING NOISE; ORIGIN;
D O I：
10.1063/1.5099212
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The motion of phase fronts during a ferroelectric phase transition is intermittent and follows avalanche dynamics. In the present study, we show that an intermittent propagation mode generates spikes of depolarization currents at an extremely slow heating rate of 0.05 K/min in BaTiO3(BTO) and 0.7Pb(Mg2/3Nb1/3)O-3-0.3PbTiO(3) (PMN-PT) single crystals. Such "jerks" are indicative of avalanche dynamics, and their energy exhibits a power law distribution with exponents of epsilon = 1.3 +/- 0.10 and epsilon = 1.5 +/- 0.10 for BTO and PMN-PT, respectively. The rate of aftershocks after big events decays as an Omori-like power-law and interevent times are characterized by a universal double power-law distribution, indicating the critical temporal correlations between the avalanche events.
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页数：5
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