Twin boundary profiles with linear-quadratic coupling between order parameters

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

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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:
Depositing User: Sarah Humbert
Date Deposited: 17 Oct 2014 17:41
Last Modified: 02 Nov 2014 00:20

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