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Pd-metal graphite (Pd-MG) has a layered structure, where each Pd sheet issandwiched between adjacent graphene sheets. DC magnetization and AC magneticsusceptibility of Pd-MG have been measured using a SQUID magnetometer. Pd-MGundergoes a superconducting transition at $T_{c}$ ($= 3.63 \pm 0.04$ K). Thesuperconductivity occurs in Pd sheets. The relaxation of $M_{ZFC}$ (aging),which is common to spin glass systems, is also observed below $T_{c}$. Therelaxation rate $S(t)$ shows a peak at a characteristic time $t_{cr}$, which islonger than a wait time $t_{w}$. The irreversibility between $\chi_{ZFC}$ and$\chi_{FC}$ occurs well above $T_{c}$. The susceptibility $\chi_{FC}$ obeys aCurie-Weiss behavior with a negative Curie-Weiss temperature ($-13.1 \leq\Theta \leq -5.4$ K). The growth of antiferromagnetic order is limited by thedisordered nature of nanographites, forming spin glass-like behavior at lowtemperatures in graphene sheets.Comment: 21 pages, 15 figures; submitted to J. Phys.: Condensed Matte

Superconductivity and magnetic short-range order in the system with a Pd sheet sandwiched between graphene sheets