Upper critical field, penetration depth, and depinning frequency of the novel high-temperature superconductor LaFeAsO${}_{0.9}$F${}_{0.1}$ studied by microwave surface impedance

Abstract

Temperature and magnetic field dependent measurements of the microwave surface impedance of superconducting LaFeAsO${}_{0.9}$F${}_{0.1}$ (\Tc $\approx$ 26K) reveal a very large upper critical field ($B_{c2}\approx 56$T) and a large value of the depinning frequency ($f_0\approx 6$GHz); together with an upper limit for the effective London penetration depth, ${\lambda }_{\mathrm{eff}}\le 200\mathrm{nm}$, our results indicate a strong similarity between this system and the high-$T_{\mathrm{c}}$ superconducting cuprates.

4 pages, 6 figures, minor corrections and rephrasing

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• Magnetic Order versus superconductivity in the Iron-based layered La(O1-xFx)FeAs systems
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• Is LaO${}_{1-x}$F${}_x$FeAs an electron-phonon superconductor ?
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• Exceptional Suppression of Flux-Flow Resistivity in FeSe${}_{0.4}$Te${}_{0.6}$ by Back-Flow from Excess Fe Atoms and Se/Te Substitutions
• Upper critical field, critical current density and thermally activated flux flow in CaFFe0.9Co0.1As superconductor