Ga-NMR local susceptibility of the kagome-based magnet   SrCr_9pGa_(12-9p)O_19. A high temperature study
  We report a high-$T$ Ga-NMR study in the kagome-based antiferromagnetic compound SrCr$_{9p}$Ga$_{12-9p}$O$_{19}$ ($.81\leq p\leq .96$), and present a refined mean-field analysis of the high T local NMR susceptibility of Cr frustrated moments. We find that the intralayer kagome coupling is $J=86(6)$ K, and the interlayer coupling through non-kagome Cr moments is $J^{\prime }=69(7)$ K. The $J^{\prime}/J=0.80(1)$ ratio confirms the common belief that the frustrated entity is a pyrochlore slab. 
L. Limot, P. Mendels, G. Collin, C. Mondelli, H. Mutka and N.   Blanchard