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We report an angle-dependent study of the magnetic torque $\tau(\theta)$within the vortex state of single-crystalline LaO$_{0.9}$F$_{0.1}$FeAs andSmO$_{0.9}$F$_{0.1}$FeAs as a function of both temperature $T$ and magneticfield $H$. Sharp peaks are observed at a critical angle $\theta_c$ at eitherside of $\theta=90^{\circ}$, where $\theta$ is the angle between $H$ and theinter-planar \emph{c}-axis. $\theta_c$ is interpreted as the critical depinningangle where the vortex lattice, pinned and locked by the intrinsic planarstructure, unlocks and acquires a component perpendicular to the planes. Weobserve a series of smaller replica peaks as a function of $\theta$ and as$\theta$ is swept away from the planar direction. These suggestcommensurability effects between the period of the vortex lattice and theinter-planar distance leading to additional kinked vortex configurations.

Vortex lock-in transition and evidence for transitions among commensurate kinked vortex configurations in single-layered Fe arsenides