Synthesis and physical properties of alkaline earth metal graphite compounds Original Research Article

We report synthesis and search for superconductivity of Ba, Sr, Ca and Mg-GIC. We adopted conventional vapor phase reaction in order to prepare high quality GICs. No superconducting transition was found for Ba and Mg-GIC. As for Sr, Sr-GIC showed a sharp superconducting transition at Tc=1.65 K. Sr graphite compound SrCx prepared from powder graphite by thermal treatment at higher temperature showed ferromagnetic character.