Absence of a Tunneling Character in c-axis Transport of SmFeAsO0.85 Single Crystals
SCIE
SCOPUS
KCI
- Title
- Absence of a Tunneling Character in c-axis Transport of SmFeAsO0.85 Single Crystals
- Authors
- Park, JH; Lee, HS; Lee, HJ; Cho, BK; Doh, YJ
- Date Issued
- 2011-01
- Publisher
- KOREAN PHYSICAL SOC
- Abstract
- We made electrical transport measurements along the c-axis of SmFeAsO0.85 single crystals in both three- and four-terminal configurations, focusing on examining the possible formation of Josephson coupling between FeAs superconducting layers. Anisotropic bulk superconductivity was observed along the c-axis, but without Josephson coupling, as confirmed by the absence of both hysteresis in the current-voltage curves and modulation of the critical current by the in-plane magnetic fields. The variation of the critical currents for different magnetic-field directions gave an anisotropy ratio of gamma similar to 5. This three-dimensional electronic structure of our iron pnictide superconductors is in clear contrast to the two-dimensional one observed in cuprate superconductors, another stacked superconducting system.
- Keywords
- Iron pnictide superconductor; Natural Josephson coupling; Anisotropy ratio; LAYERED SUPERCONDUCTOR; JOSEPHSON-JUNCTIONS; BI2SR2CACU2O8+DELTA
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/17561
- DOI
- 10.3938/JKPS.58.77
- ISSN
- 0374-4884
- Article Type
- Article
- Citation
- JOURNAL OF THE KOREAN PHYSICAL SOCIETY, vol. 58, no. 1, page. 77 - 82, 2011-01
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