LaFeAsO$_{1-x}$F$_{x}$ thin films: high upper critical fields and evidence of weak link behavior

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Authors
Haindl, S.
Kidszun, M.
Kauffmann, A.
Nenkov, K.
Kozlova, N.
Freudenberger, J.
Thersleff, T.
Haenisch, J.
Werner, J.
Reich, E.
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Abstract
Description
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.
Comment: 4 pages, 4 figures, Phys. Rev. Lett. (accepted)
Keywords
Condensed Matter - Superconductivity
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