Abstract
We present an in-depth study of the magnetic properties of the spin-1 antiferromagnet 6HB-${\mathrm{Ba}}_{3}{\mathrm{NiSb}}_{2}{\mathrm{O}}_{9}$. $\ensuremath{\mu}\mathrm{SR}$ measurements demonstrate that this material shows no static magnetism down to temperatures as low as 20 mK, making it a likely candidate for a quantum spin liquid state. $^{121}\mathrm{Sb}$ NMR shift measurements show that the local, intrinsic susceptibility levels off at temperatures below $\ensuremath{\sim}60$ K. The NMR spin-lattice relaxation rate $1/{T}_{1}$ is essentially constant in temperature and the muon relaxation rate exhibits a low-temperature relaxation plateau, all indications of gapless spin excitations. Our local probe measurements are discussed in the context of several theories proposed for this material.
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