Spectromicroscopy of electronic phase separation in KxFe2-ySe2 superconductor.

Spectromicroscopy of electronic phase separation in KxFe2-ySe2 superconductor.
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DOI:
10.1038/srep05592
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发表时间:
2014-07-07
期刊:
影响因子:
4.6
通讯作者:
Saini NL
Saini NL
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Bendele M;Barinov A;Joseph B;Innocenti D;Iadecola A;Bianconi A;Takeya H;Mizuguchi Y;Takano Y;Noji T;Hatakeda T;Koike Y;Horio M;Fujimori A;Ootsuki D;Mizokawa T;Saini NL

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AxFe 2 − ySe 2系统的结构相分离已经通过不同的实验技术进行了研究,但是,重要的是要知道电子均匀性如何受到影响,电子相共存的长度尺度以及它们的空间分布。在这里,我们使用新型扫描光电子显微镜(SPEM)来研究KxFe2−ySe2中的电子相分离,提供了不同电子相的拓扑空间分布的直接测量。的SPEM结果揭示了一个特殊的互连的导电介电相,是嵌入在绝缘纹理。在AxFe2−ySe2材料中,具有特定拓扑几何结构的晶体结构对于存在具有大磁矩的相的高Tc超导性可能是重要的。
Structural phase separation in AxFe2−ySe2 system has been studied by different experimental techniques, however, it should be important to know how the electronic uniformity is influenced, on which length scale the electronic phases coexist, and what is their spatial distribution. Here, we have used novel scanning photoelectron microscopy (SPEM) to study the electronic phase separation in KxFe2−ySe2, providing a direct measurement of the topological spatial distribution of the different electronic phases. The SPEM results reveal a peculiar interconnected conducting filamentary phase that is embedded in the insulating texture. The filamentary structure with a particular topological geometry could be important for the high Tc superconductivity in the presence of a phase with a large magnetic moment in AxFe2−ySe2 materials.
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