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Superconducting properties of Fe-based layered superconductor LaO_(0.9)F_(0.1-δ)FeAs

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arxiv 0803.0128 v2 pith:R7JASUCG submitted 2008-03-03 cond-mat.supr-con

Superconducting properties of Fe-based layered superconductor LaO_(0.9)F_(0.1-δ)FeAs

G. F. Chen , Z. Li , G. Li , J. Zhou , D. Wu , J. Dong , W. Z. Hu , P. Zheng
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Z. J. Chen H. Q. Yuan J. Singleton J. L. Luo N. L. Wang
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classification cond-mat.supr-con
keywords superconductorcarrierdeltafe-basedrathersuperconductingaboveapprox
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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.

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