Intrinsic susceptibility and bond defects in the novel two dimensional frustrated antiferromagnet Ba2Sn2ZnCr7pGa10-7pO22 -: art. no. 217202

We present microscopic and macroscopic magnetic properties of the highly frustrated antiferromagnet Ba2Sn2ZnCr7pGa10-7pO22, respectively, probed with NMR and SQUID experiments. The T variation of the intrinsic susceptibility of the Cr3+ frustrated Kagome bilayer, chi(Kag), displays a maximum around 45 K. The dilution of the magnetic lattice has been studied in detail for 0.29less than or equal topless than or equal to0.97. Novel dilution independent defects, likely related with magnetic bond disorder, are evidenced and discussed. We compare our results to SrCr9pGa12-9pO19. Both bond defects and spin vacancies do not affect the average susceptibility of the Kagome bilayers.