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To probe manifestations of multiband superconductivity in oxypnictides, wemeasured the angular dependence of magnetic torque $\tau(\theta)$ in the mixedstate of SmO$_{0.8}$F$_{0.2}$FeAs single crystals as functions of temperature$T$ and high magnetic field $H$ up to 30 T. We show that the effective massanisotropy parameter $\gamma$ extracted from $\tau(\theta)$, can be greatlyoverestimated if the strong paramagnetism of Sm or Fe ions is not properlytaken into account. The correctly extracted $\gamma$ depends on both $T$ and$H$, saturating at $\gamma \simeq 9$ at lower temperatures. Neither the Londonpenetration depth nor the superfluid density is affected by high fields fieldsup to the upper critical field. Our results indicate two strongly-coupledsuperconducting gaps of nearly equal magnitudes.

Probing multi-band superconductivity and magnetism in SmFeAsO$_{0.8}$F$_{0.2}$ single crystals by high-field vortex torque magnetometry