Glassy dynamics of domain walls in multidomain crystals

Reference Speaker Authors
Wilfried Schranz Schranz, W.(University of Vienna); Given their small size as well as the fact that their internal structures and properties can be very different from the surrounding bulk material, domain walls may play an important role in future devices. Domain walls are created e.g. when a single crystal splits into a number of domains, during a structural phase transition from a high symmetry to a low symmetry phase. The number and orientations of various domain states as well as the symmetry and structure of domain walls can be calculated by group theoretical methods [1,2]. Recently it was shown that the dynamic behaviour of multidomain crystals under external forcing depends sensitively on the structure of the domain walls [3,4]. In this talk we will present results, demonstrating how the macroscopic (dynamic elastic) response of multidomain crystals [6] is influenced by the jerky movement of domain wall segments, as detected recently by strain burst measurements [7]. Finally we will discuss some open problems. Acknowledgement: The work was supported by the Austrian Science Fund (FWF) P28672-N36. [1] V. Janovec, A symmetry approach to domain structures, Ferroelectrics 12, 43 (1976). [2] V. Janovec, W. Schranz, H. Warhanek and Z. Zikmund, Symmetry analysis of domain structure in KSCN crystals, Ferroelectrics 98,171 (1989). [4] P. Gao, et al. Ferroelastic domain switching dynamics under electrical and mechanical excitations, Nature Communications 5, 3801 (2014). [5] T. Zykova-Timan and E.K.H. Salje, Highly mobile vortex structures inside polar twin boundaries in SrTiO3, Applied Phys. Lett. 104, 082907 (2014). [6] S. Puchberger, V. Soprunyuk, A. Majchrowski, K. Roleder and W. Schranz, Domain wall motion and precursor dynamics in PbZrO3, Phys. Rev. B 94, 214101 (2016). [7] S. Puchberger, V. Soprunyuk, W. Schranz, A. Tröster, K. Roleder, A. Majchrowski, M.A. Carpenter and E.K.H. Salje, The noise of many needles: Jerky domain wall propagation in PbZrO3 and LaAlO3, APL Materials, submitted
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