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The disordered flux line lattice in single crystals of the slightly overdopedaFe_{2-x}Co_xAs_2 (x = 0.19, Tc = 23 K) superconductor is studied bymagnetization measurements, small-angle neutron scattering (SANS), and magneticforce microscopy (MFM). In the whole range of magnetic fields up to 9 T, vortexpinning precludes the formation of an ordered Abrikosov lattice. Instead, avitreous vortex phase (vortex glass) with a short-range hexagonal order isobserved. Statistical processing of MFM datasets lets us directly measure itsradial and angular distribution functions and extract the radial correlationlength \zeta. In contrast to predictions of the collective pinning model, noincrease in the correlated volume with the applied field is observed. Instead,we find that \zeta decreases as 1.3*R1 ~ H^(-1/2) over four decades of theapplied magnetic field, where R1 is the radius of the first coordination shellof the vortex lattice. Such universal scaling of \zeta implies that the vortexpinning in iron arsenides remains strong even in the absence of staticmagnetism. This result is consistent with all the real- and reciprocal-spacevortex-lattice measurements in overdoped as-grown aFe_{2-x}Co_xAs_2 publishedto date and is thus sample-independent. The failure of the collective pinningmodel suggests that the vortices remain in the single-vortex pinning limit evenin high magnetic fields up to 9 T.

Symmetry and disorder of the vitreous vortex lattice in an overdoped BaFe_{2-x}Co_xAs_2 superconductor: Indication for strong single-vortex pinning