High-field pauli-limiting behavior and strongly enhanced upper critical magnetic fields near the transition temperature of an arsenic-deficient LaO0.9F0.1FeAs1-delta superconductor.
We report upper critical field Bc2(T) data for disordered (arsenic-deficient) LaO0.9F0.1FeAs1-delta in a wide temperature and magnetic field range up to 47 T. Because of the large linear slope of Bc2 approximately -5.4 to -6.6 T/K near Tc approximately 28.5 K, the T dependence of the in-plane Bc2(T) shows a flattening near 23 K above 30 T which points to Pauli-limited behavior with Bc2(0) approximately 63-68 T. Our results are discussed in terms of disorder effects within [corrected] unconventional superconducting pairings.
Fuchs
G
G
IFW Dresden, P.O. Box 270116, D-01171 Dresden, Germany.
Drechsler
S-L
SL
Kozlova
N
N
Behr
G
G
Köhler
A
A
Werner
J
J
Nenkov
K
K
Klingeler
R
R
Hamann-Borrero
J
J
Hess
C
C
Kondrat
A
A
Grobosch
M
M
Narduzzo
A
A
Knupfer
M
M
Freudenberger
J
J
Büchner
B
B
Schultz
L
L