Segmental front line dynamics of randomly pinned ferroelastic domain walls

Puchberger, S. and Soprunyuk, V. and Schranz, W. and Carpenter, M. A. (2018) Segmental front line dynamics of randomly pinned ferroelastic domain walls. Physical Review Materials, 2 (1). ISSN 2475-9953 DOI

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Dynamic mechanical analysis (DMA) measurements as a function of temperature, frequency, and dynamic force amplitude are used to perform a detailed study of the domain wall motion in LaAlO3. In previous DMA measurements Harrison et al. [Phys. Rev. B 69, 144101 (2004)] found evidence for dynamic phase transitions of ferroelastic domain walls in LaAlO3. In the present work we focus on the creep-to-relaxation region of domain wall motion using two complementary methods. We determine, in addition to dynamic susceptibility data, waiting time distributions of strain jerks during slowly increasing stress. These strain jerks, which result from self-similar avalanches close to the depinning threshold, follow a power-law behavior with an energy exponent ɛ=1.7±0.1. Also, the distribution of waiting times between events follows a power law N(tw)∝t−(n+1)w with an exponent n=0.9, which transforms to a power law of susceptibility S(ω)∝ω−n. The present dynamic susceptibility data can be well fitted with a power law, with the same exponent (n=0.9) up to a characteristic frequency ω≈ω∗, where a crossover from stochastic DW motion to the pinned regime is well described using the scaling function of Fedorenko et al.

Item Type: Article
Uncontrolled Keywords: 2017AREP; IA74
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
08 - Green Open Access
Journal or Publication Title: Physical Review Materials
Volume: 2
Identification Number:
Depositing User: Sarah Humbert
Date Deposited: 08 Mar 2018 23:03
Last Modified: 08 Mar 2018 23:03

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