$^{63}$Cu, $^{35}$Cl, and $^{1}$H NMR in the S=1/2 Kagom\'{e} Lattice ZnCu$_{3}$(OH)$_{6}$Cl$_{2}$

ZnCu$_{3}$(OH)$_{6}$Cl$_{2}$ (S=1/2) is a promising new candidate for an ideal Kagom\'{e} Heisenberg antiferromagnet, because there is no magnetic phase transition down to $\sim $50 mK. We investigated its local magnetic and lattice environments with NMR techniques (ArXiv:cond-mat/0703141). From $^{35}$Cl Knight shift data, we demonstrate that the intrinsic spin susceptibility follows a Curie-Weiss law down to $\sim $0.2J, then decreases toward T = 0. Comparison of $^{1}$H and $^{35}$Cl spin-lattice relaxation rate 1/T$_{1}$ evidences for slow freezing of the lattice near $\sim $50 K, presumably associated with OH bonds. Spin dynamics near T = 0 obey a power-law behavior in the presence of high magnetic fields.