Ga-NMR local susceptibility of the kagome-based magnet SrCr_9pGa_(12-9p)O_19. A high temperature study

Abstract

We report a high-$T$ Ga-NMR study in the kagome-based antiferromagnetic compound SrCr${}_{9p}$Ga${}_{12-9p}$O${}_{19}$ ($.81\le p\le .96$), 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.

8 pages, 4 figures Conference paper: Highly Frustrated Magnetism 2000, Waterloo (Canada) Submitted to Canadian Journal of Physics