Microstructure and ordering of iron vacancies in the superconductor system K_yFe_xSe_2 as seen via transmission electron microscopy

Z. Wang; Y. J. Song; H. L. Shi; Z. W. Wang; Z. Chen; H. F. Tian; G. F. Chen; J. G. Guo; H. X. Yang; J. Q. Li

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Microstructure and ordering of iron vacancies in the superconductor system K_yFe_xSe_2 as seen via transmission electron microscopy

机译：透射电子显微镜观察的超导体K_yFe_xSe_2中铁空位的组织和有序性

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Structural investigations by means of transmission electron microscopy (TEM) on K_(0.8)Fe_xSe_2 and KFe_xSe_2 with 1.5 ≤ x ≤ 1.8, have revealed a rich variety of microstructure phenomena. Materials with 1.5 ≤ x ≤ 1.6 often show a superstructure modulation along the [310] zone-axis direction, and this modulation can be well interpreted by the Fe-vacancy order, which likely yields a superstructure phase of K_2Fe_4Se_5. The superconducting K_(0.8)Fe_xSe_2 and KFe_xSe2 (1.7 ≤ x ≤ 1.8) materials contain clear phase separation, in particular, along the c-axis direction, recognizable as visible parallel lamellae in the crystals; this fact suggests that the superconducting phase could have the Fe-vacancy disordered state.

机译：借助透射电子显微镜（TEM）对1.5≤x≤1.8的K_（0.8）Fe_xSe_2和KFe_xSe_2进行结构研究，发现了各种各样的微观结构现象。 1.5≤x≤1.6的材料通常会沿[310]区域轴方向显示上层结构调制，并且这种调制可以很好地用Fe空位顺序解释，这可能会产生K_2Fe_4Se_5的上层结构相。超导K_（0.8）Fe_xSe_2和KFe_xSe2（1.7≤x≤1.8）材料包含清晰的相分离，尤其是沿c轴方向的相分离，可以识别为晶体中可见的平行薄片。这一事实表明，超导相可能具有铁空位无序状态。

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《Physical review》 |2011年第14期|p.140505.1-140505.4|共4页
作者
Z. Wang; Y. J. Song; H. L. Shi; Z. W. Wang; Z. Chen; H. F. Tian; G. F. Chen; J. G. Guo; H. X. Yang; J. Q. Li;
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Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences,Beijing 100190, People's Republic of China;

Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences,Beijing 100190, People's Republic of China;

Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences,Beijing 100190, People's Republic of China;

Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences,Beijing 100190, People's Republic of China;

Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences,Beijing 100190, People's Republic of China;

Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences,Beijing 100190, People's Republic of China;

Department of Physics, Renmin University of China, Beijing 100872, People's Republic of China;

Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences,Beijing 100190, People's Republic of China;

Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences,Beijing 100190, People's Republic of China;

Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences,Beijing 100190, People's Republic of China;

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Microstructure and ordering of iron vacancies in the superconductor system K_yFe_xSe_2 as seen via transmission electron microscopy

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