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Single crystalline samples of Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$ with $x < 0.12$have been grown and characterized via microscopic, thermodynamic and transportmeasurements. With increasing Co substitution, the thermodynamic and transportsignatures of the structural (high temperature tetragonal to low temperatureorthorhombic) and magnetic (high temperature non magnetic to low temperatureantiferromagnetic) transitions are suppressed at a rate of roughly 15 K perpercent Co. In addition, for $x \ge 0.038$ superconductivity is stabilized,rising to a maximum $T_c$ of approximately 23 K for $x \approx 0.07$ anddecreasing for higher $x$ values. The $T - x$ phase diagram forBa(Fe$_{1-x}$Co$_x$)$_2$As$_2$ indicates that either superconductivity canexist in both low temperature crystallographic phases or that there is astructural phase separation. Anisotropic, superconducting, upper critical fielddata ($H_{c2}(T)$) show a significant and clear change in anisotropy betweensamples that have higher temperature structural phase transitions and thosethat do not. These data show that the superconductivity is sensitive to thesuppression of the higher temperature phase transition.

Effects of Co substitution on thermodynamic and transport properties and anisotropic $H_{c2}$ in Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$ single crystals