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The magnetic properties of Cs$_2$Cu$_3$CeF$_{12}$ were investigated throughmagnetization and specific heat measurements. Cs$_2$Cu$_3$CeF$_{12}$ iscomposed of a buckled kagome lattice of Cu$^{2+}$, which is stacked along the baxis. The exchange network in the buckled kagome lattice is stronglyanisotropic. Consequently, Cs$_2$Cu$_3$CeF$_{12}$ can be divided into twosubsystems: alternating Heisenberg chains with strong antiferromagneticexchange interactions and dangling spins. The dangling spins couple with oneanother via effective exchange interactions, which are mediated by chain spins.The dangling spins are further divided into two subsystems, DS1 and DS2. Thedangling spins in DS1 undergo three-dimensional ferromagnetic ordering at 3.14K, while those in DS2 remain paramagnetic down to 0.35 K. The effectiveinteraction between the DS1 spins is approximately expressed by theferromagnetic $XXZ$ model with the $z$ direction parallel to thecrystallographic c axis. A magnetic phase diagram for $H {\parallel} c$ wasobtained and was analyzed within the framework of the molecular fieldapproximation. With increasing magnetic field, the dangling spins are polarizedand the magnetization curve exhibits a wide plateau at one-third of thesaturation magnetization.

Ferromagnetism induced in anisotropic stacked kagome-lattice antiferromagnet Cs$_2$Cu$_3$CeF$_{12}$