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Temperature and magnetic field dependent measurements of the microwavesurface impedance of superconducting LaFeAsO$_{0.9}$F$_{0.1}$ (\Tc $\approx$26K) reveal a very large upper critical field ($B_{\rm c2} \approx 56$T) and alarge value of the depinning frequency ($f_{0}\approx 6$GHz); together with anupper limit for the effective London penetration depth, $\lambda_{\rm eff} \le200 \rm nm$, our results indicate a strong similarity between this system andthe high-$T_{\rm c}$ superconducting cuprates.

physical review. b, condensed matter and materials physics

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