Superconducting properties of Ce$_{2}$CoIn$_{8}$

The new family of Ce-based heavy-fermion compounds with the general formula Ce$_{n}$TIn$_{3n+2}$ (T=transition metal) have attracted sparked interest in recent years owing to their various interesting phenomena, such as pressure induced superconductivity, quantum criticality, and non-Fermi liquid behaviors. However, among n=2 compounds, Ce$_{2}$CoIn$_{8}$ has not been studied sufficiently mainly because of the difficulty in the synthesis of crystals of decent size. Herein, we report the successful reproduction of Ce$_{2}$CoIn$_{8}$ single crystals and present their magnetic, thermal and transport properties. Observed anomalies in resistivity and their magnetic field dependence will be explained within the context of a filamentary superconductivity. The nature and possible origin of the resistivity transition is discussed in comparison with that in CeIrIn$_{5}$.