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We have studied the lower critical fields H_{c1} of superconducting ironoxipnictide PrFeAsO_{1-y} single crystals for H parallel and perpendicular tothe ab-planes. Measurements of the local magnetic induction at positionsstraddling the sample edge by using a miniature Hall-sensor array clearlyresolve the first flux penetration from the Meissner state. The temperaturedependence of H_{c1} for H || c is well scaled by the in-plane penetrationdepth without showing any unusual behavior, in contrast to previous reports.The anisotropy of penetration lengths at low temperatures is estimated to be ~2.5, which is much smaller than the anisotropy of the coherence lengths. Thisis indicative of multiband superconductivity in this system, in which theactive band for superconductivity is more anisotropic. We also point out thatthe local induction measured at a position near the center of the crystal,which has been used in a number of reports for the determination of H_{c1},might seriously overestimate the obtained H_{c1}-value.

Lower Critical Fields of Superconducting PrFeAsO$_{1-y}$ Single Crystals