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

doi:10.1088/1674-1056/24/7/077402

中国物理B ›› 2015, Vol. 24 ›› Issue (7): 77402-077402.doi: 10.1088/1674-1056/24/7/077402

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

巩靖^a, 侯兴元^a, 朱军^a, 揭云印^a, 谷亚东^{a b}, 沈冰^a, 任聪^a, 李春红^a, 单磊^{a c}

a Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China;
b School of Physics and Engineering, Zhengzhou University, Zhengzhou 450001, China;
c Collaborative Innovation Center of Quantum Matter, Beijing 100190, China

收稿日期:2015-05-07 修回日期:2015-05-14 出版日期:2015-07-05 发布日期:2015-07-05
基金资助:
Project 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), and the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (Grant No. XDB07020300).

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

Gong Jing (巩靖)^a, Hou Xing-Yuan (侯兴元)^a, Zhu Jun (朱军)^a, Jie Yun-Yin (揭云印)^a, Gu Ya-Dong (谷亚东)^{a b}, Shen Bing (沈冰)^a, Ren Cong (任聪)^a, Li Chun-Hong (李春红)^a, Shan Lei (单磊)^{a c}

a Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China;
b School of Physics and Engineering, Zhengzhou University, Zhengzhou 450001, China;
c Collaborative Innovation Center of Quantum Matter, Beijing 100190, China

Received:2015-05-07 Revised:2015-05-14 Online:2015-07-05 Published:2015-07-05
Contact: Shan Lei E-mail:lshan@iphy.ac.cn
Supported by:
Project 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), and the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (Grant No. XDB07020300).

摘要/Abstract

摘要：

We report scanning tunneling microscopy/spectroscopy (STM/STS) studies on iron-based superconductors of Ba_1-xK_xFe₂As₂ 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

Abstract:

Key words: superconductor, scanning tunneling microscopy, paring mechanism, spin excitations

中图分类号: (Tunneling phenomena: single particle tunneling and STM)

74.55.+v

74.70.Xa (Pnictides and chalcogenides) 74.20.Mn (Nonconventional mechanisms)

巩靖, 侯兴元, 朱军, 揭云印, 谷亚东, 沈冰, 任聪, 李春红, 单磊. Observation of mode-like features in tunneling spectra of iron-based superconductors[J]. 中国物理B, 2015, 24(7): 77402-077402.

Gong Jing (巩靖), Hou Xing-Yuan (侯兴元), Zhu Jun (朱军), Jie Yun-Yin (揭云印), Gu Ya-Dong (谷亚东), Shen Bing (沈冰), Ren Cong (任聪), Li Chun-Hong (李春红), Shan Lei (单磊). Observation of mode-like features in tunneling spectra of iron-based superconductors[J]. Chin. Phys. B, 2015, 24(7): 77402-077402.

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

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

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