Giant domain wall response of highly twinned ferroelastic materials

Autor(en)

Wilfried Schranz, Heinz Kabelka, Alexander Sarras, M Burock

Abstrakt

Many ferroelastic crystals display at sufficiently low measurement frequencies a huge elastic softening below T-c 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, LaAlO3; La1-xNdxP5O14, and NH4HC2O4 center dot 1/2H(2)O yields excellent agreement.

Organisation(en)

Physik Funktioneller Materialien

Externe Organisation(en)

Universität Wien

Journal

Applied Physics Letters

Band

101

Anzahl der Seiten

4

ISSN

0003-6951

DOI

https://doi.org/10.1063/1.4757992

Publikationsdatum

2012

Peer-reviewed

Ja

ÖFOS 2012

103018 Materialphysik

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/ce943af7-f01c-4a25-b51c-4ec24d002aa0