title: Strain intermittency due to avalanches in ferroelastic and porous materials.
abstract: The avalanche statistics in porous materials and ferroelastic domain wall systems has been studied for slowly increasing compressive uniaxial stress with stress rates between 0.2 and 17 kPa s-1. Velocity peaks [Formula: see text] are calculated from the measured strain drops and used to determine the corresponding Energy distributions [Formula: see text]. Power law distributions [Formula: see text] have been obtained over 4-6 decades. For most of the porous materials and domain wall systems an exponent [Formula: see text] was obtained in good agreement with mean-field theory of the interface pinning transition. For charcoal, shale and calcareous schist we found significant deviations of the exponents from mean-field values in agreement with recent acoustic emission experiments.
authors.affiliation: Faculty of Physics, University of Vienna, Boltzmanngasse 5, 1090 Wien, Austria.
authors.forename: V
authors.initials: V
authors.lastname: Soprunyuk
authors.forename: S
authors.initials: S
authors.lastname: Puchberger
authors.forename: A
authors.initials: A
authors.lastname: Tröster
authors.forename: E
authors.initials: E
authors.lastname: Vives
authors.forename: E K H
authors.initials: EKH
authors.lastname: Salje
authors.forename: W
authors.initials: W
authors.lastname: Schranz