Freezing the 2D distorted kagome spin liquid Nd$_3$Ga$_5$SiO$_{14}$

The distorted kagome system Nd$_3$Ga$_5$SiO$_{14}$ has been investigated with neutron scattering down to 0.046 K with no evidence of magnetic long-ranged order of the Nd$^{3+}$ moments in zero field. Substantial diffuse scattering is observed which is consistent with previous measurements of nearest neighbor correlations between the fluctuating spins. Upon the application of a magnetic field in the c-direction, the diffuse scattering is reduced in intensity while magnetic Bragg peaks grow in intensity to saturate by 1 T. The net moment along the c-axis is 1.5(1) $\mu_{B}$, only 1/2 of the value of the full moment of 3.2 $\mu_{B}$ per Nd spin, consistent with a 1/2 magnetization plateau in the DC susceptibility. A phase diagram is constructed to denote the boundary between a 2D spin liquid and spin solid phase.