Transition from tunneling regime to local point contact realized on Ba0.6K0.4Fe2As2 surface

doi:10.1088/1674-1056/26/6/067402

中国物理B ›› 2017, Vol. 26 ›› Issue (6): 67402-067402.doi: 10.1088/1674-1056/26/6/067402

所属专题： Virtual Special Topic — High temperature superconductivity

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

Transition from tunneling regime to local point contact realized on Ba_0.6K_0.4Fe₂As₂ surface

Xingyuan Hou(侯兴元), Yunyin Jie(揭云印), Jing Gong(巩靖), Bing Shen(沈冰), Hai Zi(子海), Chunhong Li(李春红), Cong Ren(任聪), Lei Shan(单磊)

1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
3 Collaborative Innovation Center of Quantum Matter, Beijing 100190, China

收稿日期:2017-03-06 修回日期:2017-03-21 出版日期:2017-06-05 发布日期:2017-06-05
通讯作者: Lei Shan E-mail:lshan@iphy.ac.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11574372 and 11322432) and the "Strategic Priority Research Program (B)" of the Chinese Academy of Sciences (Grant No. XDB07020300).

Transition from tunneling regime to local point contact realized on Ba_0.6K_0.4Fe₂As₂ surface

Xingyuan Hou(侯兴元)^1,2, Yunyin Jie(揭云印)^1,2, Jing Gong(巩靖)^1,2, Bing Shen(沈冰)², Hai Zi(子海)², Chunhong Li(李春红)², Cong Ren(任聪)², Lei Shan(单磊)^1,2,3

1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
3 Collaborative Innovation Center of Quantum Matter, Beijing 100190, China

Received:2017-03-06 Revised:2017-03-21 Online:2017-06-05 Published:2017-06-05
Contact: Lei Shan E-mail:lshan@iphy.ac.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11574372 and 11322432) and the "Strategic Priority Research Program (B)" of the Chinese Academy of Sciences (Grant No. XDB07020300).

摘要/Abstract

摘要：

Using scanning tunneling spectroscopy, we studied the transition from tunneling regime to local point contact on the iron-based superconductor Ba_0.6K_0.4Fe₂As₂. By gradually reducing the junction resistance, a series of spectra were obtained with the characteristics evolving from single-particle tunneling into Andreev reflection. The spectra can be well fitted to the modified Blonder-Tinkham-Klapwijk (BTK) model and exhibit significant changes of both spectral broadening and orbital selection due to the formation of point contact. The spatial resolution of the point contact was estimated to be several nanometers, providing a unique way to study the inhomogeneity of unconventional superconductors on such a scale.

关键词: iron-based superconductor, tunneling spectra, point contact spectra

Abstract:

Key words: iron-based superconductor, tunneling spectra, point contact spectra

中图分类号: (Proximity effects; Andreev reflection; SN and SNS junctions)

74.45.+c

74.50.+r (Tunneling phenomena; Josephson effects) 74.70.Xa (Pnictides and chalcogenides) 74.81.-g (Inhomogeneous superconductors and superconducting systems, including electronic inhomogeneities)

侯兴元, 揭云印, 巩靖, 沈冰, 子海, 李春红, 任聪, 单磊. Transition from tunneling regime to local point contact realized on Ba_0.6K_0.4Fe₂As₂ surface[J]. 中国物理B, 2017, 26(6): 67402-067402.

Xingyuan Hou(侯兴元), Yunyin Jie(揭云印), Jing Gong(巩靖), Bing Shen(沈冰), Hai Zi(子海), Chunhong Li(李春红), Cong Ren(任聪), Lei Shan(单磊). Transition from tunneling regime to local point contact realized on Ba_0.6K_0.4Fe₂As₂ surface[J]. Chin. Phys. B, 2017, 26(6): 67402-067402.

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Transition from tunneling regime to local point contact realized on Ba_0.6K_0.4Fe₂As₂ surface

Transition from tunneling regime to local point contact realized on Ba_0.6K_0.4Fe₂As₂ surface

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