Homogenous reduced moment in a gapful scalar chiral kagome antiferromagnet.

We present present a quantitative experimental investigation of the scalar chiral magnetic order with in $\rm{Nd_3Sb_3Mg_2O_{14}}$. Static magnetization reveals a net ferromagnetic ground state, and inelastic neutron scattering from the hyperfine coupled nuclear spin reveals a local ordered moment of 1.76(6) $\mu_B$, just 61(2)\% of the saturated moment size. The experiments exclude static disorder as the source of the reduced moment. A 38(1)$\> \mu$eV gap in the magnetic excitation spectrum inferred from heat capacity rules out thermal fluctuations and suggests a multipolar explanation for the moment reduction. We compare $\rm{Nd_3Sb_3Mg_2O_{14}}$ to Nd pyrochlores and show that $\rm Nd_2Zr_2O_7$ is in a spin fragmented state using nuclear Schottky heat capacity.