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Author:

Xu, Yangyang (Xu, Yangyang.) | Zhou, Yumei (Zhou, Yumei.) | Xue, Dezhen (Xue, Dezhen.) | Ding, Xiangdong (Ding, Xiangdong.) | Sun, Jun (Sun, Jun.) | Salje, E.K.H (Salje, E.K.H.)

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Abstract:

A ferroelectric hysteresis depends on the orientation of the applied field with respect to the spontaneous polarization. The ferroelectric switching occurs through correlated domain movements forming avalanches. We tested whether avalanches in single crystals of the prototypic ferroelectric BaTiO3 and the relaxor ferroelectric 0.7Pb(Mg2/3Nb1/3)O3-0.3PbTiO3 show anisotropic field dependences. The anisotropy of the energy exponent of avalanches is very small in BaTiO3 with exponents between 1.53 and 1.6, which is remarkably close to the prediction of mean field theory 5/3. The anisotropy is much stronger in 0.7Pb(Mg2/3Nb1/3)O3-0.3PbTiO3 with one exponent slightly above the typical range of mean field values (4/3-5/3): 1.43 ± 0.02, 1.64 ± 0.03, and 1.79 ± 0.03 for fields along [100], [110], and [111], respectively. This anisotropy indicates a variation of the fractal dimensions of the transient domain patterns depending on the direction of the switching field. © 2020 Author(s).

Keyword:

Anisotropy Barium titanate Ferroelectricity Ferroelectric materials Fractal dimension Lead titanate Magnesium compounds Mean field theory Niobium compounds

Author Community:

  • [ 1 ] [Xu, Yangyang]State Key Laboratory for Mechanical Behavior of Materials, Xian Jiaotong University, Xi'an; 710049, China
  • [ 2 ] [Zhou, Yumei]State Key Laboratory for Mechanical Behavior of Materials, Xian Jiaotong University, Xi'an; 710049, China
  • [ 3 ] [Xue, Dezhen]State Key Laboratory for Mechanical Behavior of Materials, Xian Jiaotong University, Xi'an; 710049, China
  • [ 4 ] [Ding, Xiangdong]State Key Laboratory for Mechanical Behavior of Materials, Xian Jiaotong University, Xi'an; 710049, China
  • [ 5 ] [Sun, Jun]State Key Laboratory for Mechanical Behavior of Materials, Xian Jiaotong University, Xi'an; 710049, China
  • [ 6 ] [Salje, E.K.H.]State Key Laboratory for Mechanical Behavior of Materials, Xian Jiaotong University, Xi'an; 710049, China
  • [ 7 ] [Salje, E.K.H.]Department of Earth Sciences, Cambridge University, Downing Street, Cambridge; CB2 3EQ, United Kingdom

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Source :

Applied Physics Letters

ISSN: 0003-6951

Year: 2020

Issue: 17

Volume: 117

3 . 7 9 1

JCR@2020

3 . 7 9 1

JCR@2020

ESI Discipline: PHYSICS;

ESI HC Threshold:54

CAS Journal Grade:3

Cited Count:

WoS CC Cited Count: 3

SCOPUS Cited Count: 8

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 1

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