Observation of two-gap superconductivity in SrFe1.85Co0.15As2 single crystals by scanning tunneling microscopy and spectroscopy
SCIE
SCOPUS
- Title
- Observation of two-gap superconductivity in SrFe1.85Co0.15As2 single crystals by scanning tunneling microscopy and spectroscopy
- Authors
- Park, J; Khim, S; Jeon, GS; Kim, JS; Kim, KH; Char, K
- Date Issued
- 2011-03-02
- Publisher
- IOP PUBLISHING LTD
- Abstract
- Superconducting properties of SrFe1.85Co0.15As2 single crystals and their parent material, SrFe2As2, were investigated by scanning tunneling microscopy and spectroscopy (STM/S). In the parent material, we modeled surface conditions on the in situ cleaved single crystals, based on the observation of 2x1 stripe patterns and p root 2 x root 2 square-lattice patterns in the atomic-resolution topography images and with the help of local density of states measurements. In the STM/S studies on SrFe1.85Co0.15As2, a robust superconducting gap (2 Delta(large) = 17.3 meV) was observed in the conductance spectra measured along a line on the SrFe1.85Co0.15As2 surface. Moreover, an additional small gap-like (2 Delta(small) = 2.9 meV) structure was simultaneously observed. Our observation corroborates the two-gap structures in iron-based superconductors.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/11811
- DOI
- 10.1088/1367-2630/13/3/033005
- ISSN
- 1367-2630
- Article Type
- Article
- Citation
- NEW JOURNAL OF PHYSICS, vol. 13, 2011-03-02
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