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Upper critical field, penetration depth, and depinning frequency of the high-temperature superconductor LaFeAsO_0.9F_0.1 studied by microwave surface impedance

Temperature and magnetic field dependent measurements of the microwave surface impedance in the novel superconductor LaO_0.9F_0.1FeAs reveal a very large upper critical field (\Bc2~$\approx 56$T) and a large value of the depinning frequency (f_0 \approx 6GHz) together with the measured effective penetration depth, \lambda_eff=200 \pm 50$nm, our results indicate a stark similarity between this system and the high-T_c superconducting cuprates.

microwave response; upper critical fields; penetration depth

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