High upper critical fields and evidence of weak-link behavior in superconducting LaFeAsO1-xFx thin films.
Superconducting LaFeAsO1-xFx thin films were grown on single crystalline LaAlO3 substrates with critical temperatures (onset) up to 28 K. Resistive measurements in high magnetic fields up to 40 T reveal a paramagnetically limited upper critical field mu{0}H{c2}(0) around 77 T and a remarkable steep slope of -6.2 T K-1 near T{c}. From transport measurements we observed weak-link behavior in low magnetic fields and evidence for a broad reversible regime.
Haindl
S
S
IFW Dresden, P. O. Box 270116, D-01171 Dresden, Germany. S.Haindl@ifw-dresden.de
Kidszun
M
M
Kauffmann
A
A
Nenkov
K
K
Kozlova
N
N
Freudenberger
J
J
Thersleff
T
T
Hänisch
J
J
Werner
J
J
Reich
E
E
Schultz
L
L
Holzapfel
B
B