Physics – Condensed Matter – Superconductivity
Scientific paper
2008-03-03
Phys. Rev. Lett. 101, 057007 (2008)
Physics
Condensed Matter
Superconductivity
4 pages, 5 figures, Phys. Rev. Lett. (accepted)
Scientific paper
10.1103/PhysRevLett.101.057007
We have employed a new route to synthesize single phase F-doped LaOFeAs compound and confirmed the superconductivity above 20 K in this Fe-based system. We show that the new superconductor has a rather high upper critical field of about 54 T. A clear signature of superconducting gap opening below T$_c$ was observed in the far-infrared reflectance spectra, with 2$\Delta/\textit{k}T_c\approx$3.5-4.2. Furthermore, we show that the new superconductor has electron-type conducting carrier with a rather low carrier density.
Chen Guo-Feng
Chen Zhi-Jian
Dong Jingcheng
Hu W.-Z.
Li Gaojun
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