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The superconducting penetration depth, $\lambda(T)$, has been measured inRFeAsO$_{0.9}$F$_{0.1}$ (R=La,Nd) single crystals (R-1111). In Nd-1111, we findan upturn in $\lambda(T)$ upon cooling and attribute it to the paramagnetism ofthe Nd ions, similar to the case of the electron-doped cuprate Nd-Ce-Cu-O.After the correction for paramagnetism, the London penetration depth variationis found to follow a power-law behavior, $\Delta \lambda_L(T)\propto T^{2}$ atlow temperatures. The same $T^2$ variation of $\lambda(T)$ was found innon-magnetic La-1111 crystals. Analysis of the superfluid density and ofpenetration depth anisotropy over the full temperature range is consistent withtwo-gap superconductivity. Based on this and on our previous work, we concludethat both the RFeAsO (1111) and BaFe$_2$As$_2$ (122) families of pnictidesuperconductors exhibit unconventional two-gap superconductivity.

Non-exponential London penetration depth in RFeAsO$_{0.9}$F$_{0.1}$ (R=La,Nd) single crystals