Superconducting fluctuation effect in CaFe$_{0.88}$Co$_{0.12}$AsF*

Out-of-plane angular dependent torque measurements were performed on CaFe$_{0.88}$Co$_{0.12}$AsF single crystals. Superconducting fluctuations, featured by magnetic field enhanced and exponential temperature dependent diamagnetism, are observed above the superconducting transition temperature $T_c$, which is similar to that of cuprate superconductors, but less pronounced. In addition, the ratio of $T_c$ versus superfluid density follows well the Uemura line of high-$T_c$ cuprates, which suggests the exotic nature of the superconductivity in CaFe$_{0.88}$Co$_{0.12}$AsF