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The upper critical field $\mu_0H_{c2}(T_c)$ ofTl$_{0.58}$Rb$_{0.42}$Fe$_{1.72}$Se$_2$ single crystals has been determined bymeans of measuring the electrical resistivity in both a pulsed magnetic field($\sim$60T) and a DC magnetic field ($\sim$14T). It is found that $H_{c2}$linearly increases with decreasing temperature for $\textbf{H}$$\parallel$$c$,reaching $\mu_0H_{c2}^{\textbf{H}\parallel c}(0\textrm{K})\simeq60$ T. On theother hand, a larger $\mu_0H_{c2}(0\textrm{K})$ with a strong convex curvatureis observed for $\textbf{H}$$\perp$$c$ ($\mu_0H_{c2}^{\textbf{H}\perpc}$(18K)$\simeq$60T). This compound shows a moderate anisotropy of the uppercritical field around $T_c$, but decreases with decreasing temperature.Analysis of the upper critical field based on the Werthamer-Helfand-Hohenberg(WHH) method indicates that $\mu_0H_{c2}(0\textrm{K})$ is orbitally limited for$\textbf{H}$$\parallel$$c$, but the effect of spin paramagnetism may play animportant role on the pair breaking for $\textbf{H}$$\perp$$c$. All theseexperimental observations remarkably resemble those of the iron pnictidesuperconductors, suggesting a unified scenario for the iron-basedsuperconductors. Moreover, the superconducting transition is significantlybroadened upon applying a magnetic field, indicating strong thermal fluctuationeffects in the superconducting state ofTl$_{0.58}$Rb$_{0.42}$Fe$_{1.72}$Se$_2$. The derived thermal activation energyfor vortex motion is compatible with those of the 1111-type iron pnictides.

Upper critical field and thermally activated flux flow in single crystalline Tl$_{0.58}$Rb$_{0.42}$Fe$_{1.72}$Se$_2$