Statistical analysis of emission, interaction and annihilation of phonons by kink motion in ferroelastic materials

Zhang, Libo and Li, Suzhi and Ding, Xiangdong and Sun, Jun and Salje, Ekhard K. H. (2020) Statistical analysis of emission, interaction and annihilation of phonons by kink motion in ferroelastic materials. Applied Physics Letters, 116 (10). p. 102902. ISSN 0003-6951, ESSN: 1077-3118 DOI https://doi.org/10.1063/1.5143977

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Abstract

Our early work showed that the evolution of the twin boundary pattern exhibits an avalanche behavior upon external loading of ferroelastic materials [Salje et al., Phys. Rev. B 83, 104109 (2011)]. The distribution of “jerks” (singularities of potential energy change) was found to follow a power law distribution below a Vogel–Fulcher temperature, mainly related to the movement of kinks in domain boundaries. We use molecular dynamics simulations to study the nucleation, scattering, and annihilation of phonons that are generated by the nucleation and propagation of such kinks. The interaction and scattering of phonons are correlated over a short time period and gradually become uncorrelated before annihilation at large temperature intervals. The movement and interaction of phonons show avalanche behavior. The probability of finding energy jerks follows a power law with exponents around 2.5–3. The distribution of waiting times between jerks also follows a power law. At temperatures above the Vogel–Fulcher temperature, scattering with thermal phonons becomes predominant and no phononic avalanches were observed.

Item Type: Article
Uncontrolled Keywords: 2020AREP; IA76
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
Journal or Publication Title: Applied Physics Letters
Volume: 116
Page Range: p. 102902
Identification Number: https://doi.org/10.1063/1.5143977
Depositing User: Sarah Humbert
Date Deposited: 08 Apr 2020 17:49
Last Modified: 08 Apr 2020 17:49
URI: http://eprints.esc.cam.ac.uk/id/eprint/4674

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