Giant domain wall response of highly twinned ferroelastic materials
arXiv:1601.03590 · doi:10.1063/1.4757992
Abstract
Many ferroelastic crystals display at sufficiently low measurement frequencies a huge elastic softening below Tc which is caused by domain wall motion. Materials range from perovskites to iron based superconductors and shape memory materials. We present a model - based on Landau-Ginzburg theory including long range elastic interaction between needle shaped ferroelastic domains - to describe the observed superelastic softening. The theory predicts that the domain wall contribution to the elastic susceptibility is different for improper and proper ferroelastic materials. A test of the theory against experimental data on SrTiO3, KMnF3, LaAlO3, La1-xNdxP5O14 and NH4HC2O4.1/2H2O yields excellent agreement.
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Cited by in corpus (6)
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- Symmetry breaking in hexagonal and cubic polymorphs of BaTiO3
- Segmental front line dynamics of randomly pinned ferroelastic domain walls
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