Order-disorder, ferroelasticity and mobility of domain walls in multiferroic Cu-Cl boracite.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
C M Fernandez-PosadaM A Carpenter

Abstract

Domain walls in Cu-Cl boracite develop as a consequence of an improper ferroelastic, improper ferroelectric transition, and have attracted close interest because some are conductive and all can be mechanically written and repositioned by application of an electric field. The phase transition and its associated dynamical properties have been analysed here from the perspective of strain and elasticity. Determination of spontaneous strains from published lattice parameter data has allowed the equilibrium long-range order parameter for F [Formula: see text]3c → Pca21 to be modelled simply as being close to the order-disorder limit. High acoustic loss in the cubic phase, revealed by resonant ultrasound spectroscopy, is consistent with the presence of dynamical microdomains of the orthorhombic structure with relaxation times in the vicinity of ∼10-5-10-6 s. Low acoustic loss in the stability field of the orthorhombic structure signifies, on the other hand, that ferroelastic twin walls which develop as a consequence of the order-disorder process are immobile on this time scale. A Debye loss peak accompanied by ∼1% elastic stiffening at ∼40 K is indicative of some freezing of defects which couple with strain or of some more intrinsic f...Continue Reading

References

Jan 27, 2009·Nature Materials·J SeidelR Ramesh
Mar 11, 2010·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Ekhard K H Salje
Jan 27, 2010·Journal of Physics. Condensed Matter : an Institute of Physics Journal·M A CarpenterJ D Bass
Jan 27, 2010·Journal of Physics. Condensed Matter : an Institute of Physics Journal·M A CarpenterT W Darling
Jan 27, 2010·Journal of Physics. Condensed Matter : an Institute of Physics Journal·M A CarpenterT W Darling
Jan 7, 2009·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Ruth E A McKnightM A Carpenter
Dec 22, 2011·Journal of Physics. Condensed Matter : an Institute of Physics Journal·M A CarpenterN J Donnelly
Sep 22, 2012·Nano Letters·R K VasudevanS V Kalinin
Nov 25, 2014·Journal of Physics. Condensed Matter : an Institute of Physics Journal·N J PerksM A Carpenter
Jun 9, 2015·Journal of Physics. Condensed Matter : an Institute of Physics Journal·M A Carpenter
May 17, 2017·Nature Communications·Raymond G P McQuaidJ Marty Gregg
Jul 12, 2017·Science Advances·Pankaj SharmaJan Seidel
Dec 24, 2018·Physical Review Letters·David PesqueraEkhard K H Salje

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