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

G. Li, G. Grissonnanche, B. S. Conner +7

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 and SmO${}_{0.9}$F${}_{0.1}$FeAs as a function o…