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Nd-based pyrochlore oxides of the form Nd$_{2}B_{2}$O$_{7}$ have garnered asignificant amount of interest owing to the moment fragmentation physicsobserved in Nd$_{2}$Zr$_{2}$O$_{7}$ and speculated in Nd$_{2}$Hf$_{2}$O$_{7}$.Notably this phenomenon is not ubiquitous in this family, as it is absent inNd$_{2}$Sn$_{2}$O$_{7}$, which features a smaller ionic radius on the $B$-site.Here, we explore the necessary conditions for moment fragmentation in the Ndpyrochlore family through a detailed study of the mixed $B$-site pyrochloreNd$_{2}$GaSbO$_{7}$. The $B$-site of this system is characterized bysignificant disorder and an extremely small average ionic radius. Similarly toNd$_{2}$Sn$_{2}$O$_{7}$, we find no evidence for moment fragmentation throughour bulk characterization and neutron scattering experiments, indicating thatchemical pressure (and not necessarily the $B$-site disorder) plays a key rolein the presence or absence of this phenomenon in this material family.Surprisingly, the presence of significant $B$-site disorder inNd$_{2}$GaSbO$_{7}$ does not generate a spin glass ground state and instead thesame all-in-all-out magnetic order identified in other Nd pyrochlores is foundhere.

Absence of moment fragmentation in the mixed $B$-site pyrochlore Nd$_{2}$GaSbO$_{7}$