The noise of many needles: Jerky domain wall propagation in PbZrO3 and LaAlO3

Puchberger, S. and Soprunyuk, V. and Schranz, W. and Tröster, A. and Roleder, K. and Majchrowski, A. and Carpenter, M. A. and Salje, E. K. H. (2017) The noise of many needles: Jerky domain wall propagation in PbZrO3 and LaAlO3. APL Materials, 5 (4). 046102. ISSN 2166-532X DOI

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Measurements of the sample length of PbZrO3 and LaAlO3 under slowly increasing force (3-30 mN/min) yield a superposition of a continuous decrease interrupted by discontinuous drops. This strain intermittency is induced by the jerky movement of ferroelastic domain walls through avalanches near the depinning threshold. At temperatures close to the domain freezing regime, the distributions of the calculated squared drop velocity maxima N(υ2m)N(υm2) follow a power law behaviour with exponents ε=1.6±0.2ε=1.6±0.2. This is in good agreement with the energy exponent ε=1.8±0.2ε=1.8±0.2 recently found for the movement of a single needle tip in LaAlO3 [R. J. Harrison and E. K. H. Salje, Appl. Phys. Lett. 97, 021907 (2010)]. With increasing temperature, N(υ2m)N(υm2) changes from a power law at low temperatures to an exponential law at elevated temperatures, indicating that thermal fluctuations increasingly enable domain wall segments to unpin even when the driving force is smaller than the corresponding barrier.

Item Type: Article
Uncontrolled Keywords: 2017AREP; IA72;
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
07 - Gold Open Access
Journal or Publication Title: APL Materials
Volume: 5
Page Range: 046102
Identification Number:
Depositing User: Sarah Humbert
Date Deposited: 15 May 2017 10:21
Last Modified: 22 May 2017 09:33

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