Imaging the coexistence of a superconducting phase and a charge-density modulation in the K0.73Fe1.67Se2 superconductor using a scanning tunneling microscope
Imaging the coexistence of a superconducting phase and a charge-density modulation in the K0.73Fe1.67Se2 superconductor using a scanning tunneling microscope
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使用扫描隧道显微镜对 K0.73Fe1.67Se2 超导体中超导相和电荷密度调制的共存进行成像
DOI：
10.1103/physrevb.85.094512
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发表时间：
2012-03-23
影响因子：
3.7
通讯作者：
Wang, Yayu
中科院分区：
文献类型：
--
作者：
Cai, Peng;Ye, Cun;Wang, Yayu
本文报道了用扫描隧道显微镜研究了T-C = 32 K的铁硒化物超导体K_（0.73）Fe_（1.67）Se_2的局域结构和电子性质。在原子分辨的FeSe表面上，我们观察到一个定义良好的超导间隙和微观共存的电荷密度调制与根2 ×根2周期性相对于原始Se晶格。我们建议，一个可能的起源的图案是电子超结构所造成的块反铁磁有序的铁时刻。没有观察到广泛预期的铁空位有序，表明它不是插层铁硒化物中超导性的必要成分。
We report scanning tunneling microscopy studies of the local structural and electronic properties of the iron selenide superconductor K0.73Fe1.67Se2 with T-C = 32 K. On the atomically resolved FeSe surface, we observe a well-defined superconducting gap and the microscopic coexistence of a charge-density modulation with root 2 x root 2 periodicity with respect to the original Se lattice. We propose that a possible origin of the pattern is the electronic superstructure caused by the block-antiferromagnetic ordering of the iron moments. The widely expected iron vacancy ordering is not observed, indicating that it is not a necessary ingredient for superconductivity in the intercalated iron selenides.