Physics – Condensed Matter – Superconductivity
Scientific paper
2009-07-14
Phys. Rev. Lett. 104 (2010) 077001
Physics
Condensed Matter
Superconductivity
4 pages, 4 figures, Phys. Rev. Lett. (accepted)
Scientific paper
High-quality superconducting LaFeAsO$_{1-x}$F$_{x}$ thin films were grown on single crystalline LaAlO$_{3}$ 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 -7.5 T/K near $T_{c}$. From transport measurements we observed a weak link behavior in low magnetic fields and the evidence for a broad reversible regime.
Freudenberger Jens
Haenisch Jens
Haindl Silvia
Holzapfel Bernhard
Kauffmann Alexander
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