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Single crystals of the new ternary compound Ce2Ga12Pt were prepared by theself-flux technique. The crystal structure with the space group P4/nbm wasestablished from single-crystal X-ray diffraction data and presents aderivative of the LaGa6Ni0.6 prototype. Magnetic susceptibility measurementsshow Curie-Weiss behaviour due to local Ce^3+ moments. At high temperatures,the magnetic anisotropy is dominated by the crystal-electric-field (CEF) effectwith the easy axis along the crystallographic c direction. Ce2Ga12Pt undergoestwo antiferromagnetic phase transitions at T_N,1 = 7.3K and T_N,2 = 5.5K andpresents several metamagnetic transitions for the magnetic field along c.Specific-heat measurements prove the bulk nature of these magnetic transitionsand reveal a doublet CEF ground state. The 4f contribution to the resistivityshows a broad maximum at T_max ~ 85K due to Kondo scattering off the CEF groundstate and excited levels.

Physical properties and crystal chemistry of Ce2Ga12Pt