Magnetic topological semimetals $\mathit{Ln}\mathrm{SbTe}$ ($\mathit{Ln}=\text{lanthanide elements}$) provide a platform to study the interplay of structure, magnetism, topology, and electron correlations. Varying Sb and Te compositions in $Ln\mathrm{S}{\mathrm{b}}_x\mathrm{T}{\mathrm{e}}_{2-x}$ can effectively control the electronic, magnetic, and transport properties. Here, we report the evolution of transport properties with Sb and Te contents in $\mathrm{NdS}{\mathrm{b}}_x\mathrm{T}{\mathrm{e}}_{2-x}$, ($0<x<1$). Our work reveals nonmonotonic evolution in magnetoresistance with varying composition stoichiometry. Specifically, reducing Sb content $x$ leads to strong negative magnetoresistance up to 99.9%. Such a strong magnetoresistance, which is likely attributed to the interplay between structure, magnetism, and electronic bands, establishes this material as a promising platform for investigating topological semimetal for future device applications.

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• Magnetotransport
• Topological materials
• Nodal-line semimetals
• Crystal growth
• Resistivity measurements