Ga NMR study of the local susceptibility in SrCr8Ga4O19: pseudogap and   paramagnetic defects
  We present the first Ga(4f) NMR study of the Cr susceptibility in the archetype of Kagome based frustrated antiferromagnets, SrCr$_{8}$Ga$_{4}$O$_{19}$. Our major finding is that the susceptibility of the frustrated lattice goes through a maximum around 50 K. Our data also supports the existence of paramagnetic ``clusters'' of spins, responsible for the Curie behavior observed in the macroscopic susceptibility at low T. These results set novel features for the constantly debated physics of geometrically frustrated magnets. 
P. Mendels, A. Keren, L. Limot, M. Mekata, G. Collin and M. Horvatic