KxFe2-ySe2单晶相分离和分级结构的原位观察
In situ observation of phase separation and hierarchical microstructure of KxFe2-ySe2 single crystals
摘要：
KxFe 2-ySe 2单晶中相分离的性质还没有很好地理解。在这里，与温度相关的SEM图像提供了令人信服的证据，表明相分离对应于成核和生长过程，而不是亚稳分解。超导相是铁空位有序-无序转变后高温相的残留物。利用聚焦离子束扫描电子显微镜（FIB SEM）研究了铁空位有序基体中超导相的三维空间分布。我们的结果清楚地表明，超导相形成一个分级结构。理解这种分层结构的形成不仅可以指导未来大块超导体的合成，而且还可以极大地丰富我们对相分离和固态相变之间相互作用的知识。
英文摘要：
The nature of the phase separation in KxFe2-ySe2 single crystals is not well understood. Here, temperature dependent SEM images provide compelling evidence that phase separation corresponds to a nucleation and growth process rather than a spinodal decomposition. The superconducting phase is the remnant of high temperature phase after iron vacancy order-disorder transition. Three-dimension (3D) spatial distribution of superconducting phase in the iron vacancy ordered matrix was revealed by using focused ion beam scanning electron microscopy (FIB-SEM). Our results clearly show that superconducting phase forms a hierarchical structure. Understanding the formation of this hierarchical structure not only can guide the synthesis of bulk superconductors in the future, but also greatly enrich our knowledge about the interplay between phase separation and solid-state phase transformations.
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