The noise of many needles

Subtitle:Jerky domain wall propagation in PbZrO3 and LaAlO3
Authors/others:Puchberger, S.; Soprunyuk, V.; Schranz, W.; Tröster, A. (Technische Universität Wien); Roleder, K. (University of Silesia in Katowice); Majchrowski, A. (Military University of Technology in Warsaw); Carpenter, M. A. (University of Cambridge); Salje, E. K H (University of Cambridge)

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(υm2) follow a power law behaviour with exponents ε=1.6±0.2. This is in good agreement with the energy exponent ε=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(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.

Date of publication:1.4.2017
Journal title:APL Materials
Peer reviewed:true
Digital Object Identifier (DOI):
Publication Type:Article