Pöttker, Henning and Salje, Ekhard K. H. (2014) Twin boundary profiles with linear-quadratic coupling between order parameters. Journal of Physics: Condensed Matter, 26 (34). p. 342201. ISSN 0953-8984 DOI 10.1088/0953-8984/26/34/342201
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Abstract
A new type of twin boundary was found when two order parameters interact by linear-quadratic coupling QP2. In this solution, we find that a domain wall consists of two layers in which in one layer both order parameters Q and P are active while in the second layer only Q is active. The adjacent domains are equally asymmetric (Q, P) and (Q, 0) so that one phase could be polar and/or magnetic and contain a ferroelastic strain while the second layer is ferroelastic only without polar or magnetic properties. The two layers represent a stepwise transition between the two domains.We analyze the full phase diagram depending on the coupling constant and anisotropy of the gradient term, and show that in a certain regime the order parameter Q becomes activated only in the interfacial region. A common solution contains kinks and breathers whereby the width of the interface can be very wide in agreement with the first order character of the transition.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | 2014AREP; IA68; |
| Subjects: | 03 - Mineral Sciences |
| Divisions: | 03 - Mineral Sciences 07 - Gold Open Access |
| Journal or Publication Title: | Journal of Physics: Condensed Matter |
| Volume: | 26 |
| Page Range: | p. 342201 |
| Identification Number: | 10.1088/0953-8984/26/34/342201 |
| Depositing User: | Sarah Humbert |
| Date Deposited: | 17 Oct 2014 17:41 |
| Last Modified: | 02 Nov 2014 00:20 |
| URI: | http://eprints.esc.cam.ac.uk/id/eprint/3141 |
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