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Observation of mode-like features in tunneling spectra of iron-based superconductors

ISSN号：1674-1056
期刊名称：Chinese Physics B
时间：2015.7
页码：-
分类：O511[理学—低温物理;理学—物理] TB383[一般工业技术—材料科学与工程]
作者机构：[1]Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China, [2]School of Physics and Engineering, Zhengzhou University, Zhengzhou 450001, China, [3]Collaborative Innovation Center of Quantum Matter, Beijing 100190, China
相关基金：supported by the National Basic Research Program of China（Grant Nos.2011CBA00110 and 2012CB821403）; the National Natural Science Foundation of China（Grant Nos.11174349 and 11322432）; the Strategic Priority Research Program（B）of the Chinese Academy of Sciences（Grant No.XDB07020300）.
相关项目：铁基超导体的局域电子态研究

作者： Shen Bing|Ren Cong|Li Chun-Hong|Shan Lei|

关键词：扫描隧道显微术, 超导体, 光谱特征, 铁基, 相互作用, 线性关系, 超导机制, 温度记录, superconductor,scanning tunneling microscopy,paring mechanism,spin excitations

中文摘要：

We report scanning tunneling microscopy/spectroscopy(STM/STS) studies on iron-based superconductors of Ba1-xKx Fe2As2 and nearly optimally doped Fe(Te,Se). Mode-like features were observed universally outside the superconducting gaps in the tunneling spectra, which are similar to our previous observations in other samples and can be ascribed to the interaction between electrons and spin excitations. Furthermore, an almost linear relationship between the superconducting gaps and the superconducting transition temperatures was noted and should also be taken into account in understanding the mechanism of iron-based superconductors.

英文摘要：

We report scanning tunneling microscopy/spectroscopy（STM/STS） studies on iron-based superconductors of Ba1-xKxFe2As2 and nearly optimally doped Fe（Te,Se）. Mode-like features were observed universally outside the superconducting gaps in the tunneling spectra, which are similar to our previous observations in other samples and can be ascribed to the interaction between electrons and spin excitations. Furthermore, an almost linear relationship between the superconducting gaps and the superconducting transition temperatures was noted and should also be taken into account in understanding the mechanism of iron-based superconductors.

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