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Chin. Phys. B, 2017, Vol. 26(6): 067402    DOI: 10.1088/1674-1056/26/6/067402
Special Issue: Virtual Special Topic — High temperature superconductivity
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

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

Using scanning tunneling spectroscopy, we studied the transition from tunneling regime to local point contact on the iron-based superconductor Ba0.6K0.4Fe2As2. 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.

Keywords:  iron-based superconductor      tunneling spectra      point contact spectra  
Received:  06 March 2017      Revised:  21 March 2017      Published:  05 June 2017
PACS:  74.45.+c (Proximity effects; Andreev reflection; SN and SNS junctions)  
  74.50.+r (Tunneling phenomena; Josephson effects)  
  74.70.Xa (Pnictides and chalcogenides)  
  74.81.-g (Inhomogeneous superconductors and superconducting systems, including electronic inhomogeneities)  
Fund: 

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).

Corresponding Authors:  Lei Shan     E-mail:  lshan@iphy.ac.cn

Cite this article: 

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 Ba0.6K0.4Fe2As2 surface 2017 Chin. Phys. B 26 067402

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