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• W1568854792 abstract "The disordered flux line lattice in single crystals of the slightly overdoped ${text{BaFe}}_{2ensuremath{-}x}{text{Co}}_{x}{text{As}}_{2}$ ($x=0.19$, ${T}_{text{c}}=23text{ }text{K}$) superconductor is studied by magnetization measurements, small-angle neutron scattering, and magnetic force microscopy (MFM). In the whole range of magnetic fields up to 9 T, vortex pinning precludes the formation of an ordered Abrikosov lattice. Instead, a vitreous vortex phase (vortex glass) with a short-range hexagonal order is observed. Statistical processing of MFM data sets lets us directly measure its radial and angular distribution functions and extract the radial correlation length $ensuremath{zeta}$. In contrast to predictions of the collective pinning model, no increase in the correlated volume with the applied field is observed. Instead, we find that $ensuremath{zeta}$ decreases as $(1.3ifmmodepmelsetextpmfi{}0.1){R}_{1}ensuremath{propto}{H}^{ensuremath{-}1/2}$ over four decades of the applied magnetic field, where ${R}_{1}$ is the radius of the first coordination shell of the vortex lattice. Such universal scaling of $ensuremath{zeta}$ implies that the vortex pinning in iron arsenides remains strong even in the absence of static magnetism. This result is consistent with all the real and reciprocal-space vortex-lattice measurements in overdoped as-grown ${text{BaFe}}_{2ensuremath{-}x}{text{Co}}_{x}{text{As}}_{2}$ published to date and is thus sample independent. The failure of the collective pinning model suggests that the vortices remain in the single-vortex pinning limit even in high-magnetic fields up to 9 T." @default.
• W1568854792 created "2016-06-24" @default.
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• W1568854792 date "2010-01-19" @default.
• W1568854792 modified "2023-10-18" @default.
• W1568854792 title "Symmetry and disorder of the vitreous vortex lattice in overdopedBaFe2−xCoxAs2: Indication for strong single-vortex pinning" @default.
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• W1568854792 doi "https://doi.org/10.1103/physrevb.81.014513" @default.
• W1568854792 hasPublicationYear "2010" @default.
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