title: Superconducting properties of the Fe-based layered superconductor LaFeAsO0.9F0.1-delta.
abstract: 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 over 50 T. A clear signature of superconducting gap opening below T(c) was observed in the far-infrared reflectance spectra, with 2Delta/kT(c) approximately 3.5-4.2. Furthermore, we show that the new superconductor has electron-type conducting carriers with a rather low-carrier density.
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, China.
authors.forename: G F
authors.initials: GF
authors.lastname: Chen
authors.forename: Z
authors.initials: Z
authors.lastname: Li
authors.forename: G
authors.initials: G
authors.lastname: Li
authors.forename: J
authors.initials: J
authors.lastname: Zhou
authors.forename: D
authors.initials: D
authors.lastname: Wu
authors.forename: J
authors.initials: J
authors.lastname: Dong
authors.forename: W Z
authors.initials: WZ
authors.lastname: Hu
authors.forename: P
authors.initials: P
authors.lastname: Zheng
authors.forename: Z J
authors.initials: ZJ
authors.lastname: Chen
authors.forename: H Q
authors.initials: HQ
authors.lastname: Yuan
authors.forename: J
authors.initials: J
authors.lastname: Singleton
authors.forename: J L
authors.initials: JL
authors.lastname: Luo
authors.forename: N L
authors.initials: NL
authors.lastname: Wang