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Magnetic topological semimetals present open questions regarding theinterplay of crystal symmetry, magnetism, band topology, and electroncorrelations. $LnSb_{x}Te_{2-x-\delta}$ (Ln= lanthanide) is a family ofsquare-net-derived topological semimetals that allows compositional control ofband filling, and access to different topological states via an evolving chargedensity wave (CDW) distortion. Previously studied Gd and Ce members containinga CDW have shown complex magnetic phase diagrams, which implied that spinslocalized on Ln interact with the CDW, but to this date, no magnetic structureshave been solved within the CDW regime of this family of compounds. Here, wereport on the interplay of the CDW with magnetism in $NdSb_{x}Te_{2-x-\delta}$,by comparing the undistorted square net member $NdSb_{0.94}Te_{0.92}$ with theCDW-distorted phase $NdSb_{0.48}Te_{1.37}$, via single-crystal x-raydiffraction, magnetometry, heat capacity, and neutron powder diffraction.$NdSb_{0.94}Te_{0.92}$ is a collinear antiferromagnet with $T_N$ $\sim$ 2.7 K,where spins align antiparallel to each other, but parallel to the square net ofthe nuclear structure. $NdSb_{0.48}Te_{1.37}$ exhibits a nearly five-foldmodulated CDW ($q_{CDW}=0.18b^*$), isostructural to other$LnSb_{x}Te_{2-x-\delta}$ at similar x. $NdSb_{0.48}Te_{1.37}$ displays morecomplex magnetism with $T_N = 2.3 K$, additional metamagnetic transitions, andan elliptical cycloid magnetic structure with $q_{mag}=-0.41b^*$.The magnitudesof $q_{CDW}$ and $q_{mag}$ exhibit a integer relationship,$1+2q_{mag}=q_{CDW}$, implying a coupling between the CDW and magneticstructure. Given that the CDW is localized within the nonmagnetic distortedsquare net, we propose that conduction electrons "template" the spin modulationvia the Ruderman-Kittel-Kasuya-Yosida interaction.

Charge density wave-templated spin cycloid in topological semimetal $NdSb_{x}Te_{2-x-\delta}$