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High upper critical fields and evidence of weak-link behavior in superconducting LaFeAsO1-xFx thin films
S Haindl1, M Kidszun, A Kauffmann
1IFW Dresden, P. O. Box 270116, D-01171 Dresden, Germany. S.Haindl@ifw-dresden.de
Physical Review Letters
|April 7, 2010
Abstract:
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.

