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We performed high-field magnetotransport and magnetization measurements on asingle crystal of the 122-phase iron pnictide Ba(Fe1-xCox)2As2. Unlike the HTScuprates and 1111-phase oxypnictides, Ba(Fe1-xCox)2As2 showed practically nobroadening of the resistive transitions under magnetic fields up to 45 T. Themass anisotropy gamma = Hc2ab/Hc2c deduced from the slopes of the uppercritical field dHc2ab/dT = 4.9T/K and dHc2c/dT = 2.5T/K decreases from ~2 nearTc, to ~1.5 at lower temperatures. We observed the irreversibility field closeto Hc2, and a rather unusual symmetric volume pinning force curve Fp(H)suggestive of strong pinning nano-structure.

Small anisotropy, weak thermal fluctuations, and high field superconductivity in Co-doped iron pnictide Ba(Fe1-xCox)2As2