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Magnetization and specific heat measurements have been carried out onCs$_2$Cu$_3$ZrF$_{12}$ and Cs$_2$Cu$_3$HfF$_{12}$ single crystals, in whichCu$^{2+}$ ions with spin-1/2 form a regular Kagom\'{e} lattice. Theantiferromagnetic exchange interaction between neighboring Cu$^{2+}$ spins is$J/k_{\rm B}\simeq 360$ K and 540 K for Cs$_2$Cu$_3$ZrF$_{12}$ andCs$_2$Cu$_3$HfF$_{12}$, respectively. Structural phase transitions wereobserved at $T_{\rm t}\simeq 210$ K and 175 K for Cs$_2$Cu$_3$ZrF$_{12}$ andCs$_2$Cu$_3$HfF$_{12}$, respectively. The specific heat shows a small bendanomaly indicative of magnetic ordering at $T_\mathrm{N}= 23.5$ K and 24.5 K inCs$_2$Cu$_3$ZrF$_{12}$ and Cs$_2$Cu$_3$HfF$_{12}$, respectively. Weakferromagnetic behavior was observed below $T_\mathrm{N}$. This weakferromagnetism should be ascribed to the antisymmetric interaction of theDzyaloshinsky-Moriya type that are generally allowed in the Kagom\'{e} lattice.Comment: 6 pages, 4 figure. Conference proceeding of Highly Frustrated  Magnetism 200

S =1/2Kagomé antiferromagnets Cs2Cu3MF12with M = Zr and Hf

S =1/2Kagomé antiferromagnets Cs₂Cu₃MF₁₂with M = Zr and Hf