Superconducting properties of the Fe-based layered superconductor LaFeAsO0.9F0.1-delta.
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.
Chen
G F
GF
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, China.
Li
Z
Z
Li
G
G
Zhou
J
J
Wu
D
D
Dong
J
J
Hu
W Z
WZ
Zheng
P
P
Chen
Z J
ZJ
Yuan
H Q
HQ
Singleton
J
J
Luo
J L
JL
Wang
N L
NL