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

作　　者：巩靖 侯兴元 朱军 揭云印 谷亚东 沈冰 任聪 李春红 单磊 

机构地区：[1]Institute of Physics and Beijing National Laboratory for Condensed Matter Physics,Chinese Academy of Sciences [2]School of Physics and Engineering,Zhengzhou University [3]Collaborative Innovation Center of Quantum Matter

出　　处：《Chinese Physics B》2015年第7期28-33,共6页中国物理B（英文版）

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)

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.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.

关 键 词：SUPERCONDUCTOR scanning tunneling microscopy paring mechanism spin excitations 

分 类 号：O511[理学—低温物理] TB383[理学—物理]