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《Journal of Chinese Electron Microscopy Society》 2013-06
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Morphology and three-dimensional distribution of domains in superconductor K_(0. 8)Fe_(1. 7)SeS

CHEN Xiao;ZHOU Ting-ting;YAO Yuan;WANG Yan-guo;YU Ri-cheng;DUAN Xiao-feng;ZHANG Zhi-hua;GU Lin;School of Materials Science and Engineering,Dalian Jiaotong University;Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences;  
High-angle aunular dark-field( HAADF) imaging and dark-field imaging technologies were employed to study the superconducting domain morphology and its distribution in three dimensions. Two types of domain morphologes are idenfied along the [001]direction: one is the domain with size of about 1 μm; the other is the array of small domain with size of tens of nanometers. Selected area electron diffraction and electron energy-loss spectroscopy indicate that the parent regions correspond to the Fe-vaccany ordering while the superconduting domains may correspond to the K-vacancy ordering. STEM-EDX Mapping experiment shows a K-rich distribution near the boundary of the domains,indicating that there are at least three phases in K0. 8Fe1. 7SeS sample. In addition, observations along the [100] direction reveal that the domains are connected,providing the direct evidence for the connectivity of superconducting domains. At last,the shematic of the three-dimensional distribution of domains is established.
【Fund】: 国家自然科学基金(51372027);; 国家重点基础研究发展计划(2014CB921002);; 国家科学基金重点项目(90923037)
【CateGory Index】: O511
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