论文标题
从顺序参数和层组对称性得出的非极性材料中域边界的极性
Polarity of domain boundaries in nonpolar materials derived from order parameter and layer group symmetry
论文作者
论文摘要
结晶材料中的域边界和其他双边界正在接受越来越多的兴趣。它们可以携带独特的功能性能，在许多情况下，周围的散装材料不存在。域边界的一种此类特性可以是它们的电极性。到目前为止，对域边界极性的现象学洞察力是基于对订单参数的知识和Landau-Ginzburg自由能函数的形式，或者是基于域边界对称性的知识。在目前的工作中，我们显示了硫代钾（KSCN）和Lacunar尖晶石晶体的具体实例，即主要订单参数的概念可以帮助找到描述给定域边界最大可能对称性的层组。然后使用层组和顺序参数对称性的组合来阐明域边界极性的性质。
Domain boundaries and other twin boundaries in crystalline materials are receiving increasing interest. They can carry unique functional properties, which in many cases are absent in the surrounding bulk material. One such property of domain boundaries can be their electric polarity. Phenomenological insight in the polarity of domain boundaries was so far based either on the knowledge of the order parameter and the form of Landau-Ginzburg free energy functional, or on the knowledge of the symmetry of the domain boundaries. In the present work we show on the concrete examples of potassium thiocyanate (KSCN) and lacunar spinel crystals, that the concept of the primary order-parameter can help to find the layer group describing the maximal possible symmetry of a given domain boundary. Combination of layer group and order parameter symmetries is then employed to clarify the nature of the polarity of domain boundaries.
