Superstructures formed by orientationally ordered tetrahedra in the bcc lattice: new diffusionless order-disorder transition in solids
Superstructures formed by orientationally ordered tetrahedra in the bcc lattice: new diffusionless order-disorder transition in solids
复制标题
BCC晶格中定向有序四面体形成的超结构：固体中新的无扩散有序-无序转变
DOI：
10.1088/0953-8984/27/8/085401
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
R. Tamura
中科院分区：
文献类型：
--
作者：
尾藤輝夫;菊池俊;R. Tamura
我们研究和澄清的超结构形成的四面体在体心立方晶格的框架内的二级转变。研究了所有可能的超结构是否符合朗道和Lifshitz条件，并在此基础上证明了在反转中心含有四面体的bcc晶体可以表现出多种二级相变，这被认为是一种新型的无扩散有序-无序反铁性取向相变.最后，我们表明，过渡引起一个新的玻璃态。局域反转对称性的破缺可能导致一种新的取向玻璃，这使人联想到磁性中的自旋玻璃。
We investigated and clarified the superstructures formed by tetrahedra in the bcc lattice within the framework of second-order transitions. Compliance with both the Landau and Lifshitz conditions was investigated for all possible superstructures and, based on this, we demonstrate that bcc crystals that contain tetrahedra at an inversion center can exhibit a variety of second-order transitions, which are regarded as a new type of diffusionless order-disorder transition with antiferroic orientational orders. Finally, we show that the transition gives rise to a new glassy state. Breaking of the local inversion symmetry may lead to a new orientational glass, which is reminiscent of spin glasses in magnetism.