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The magnetic Ln$^{3+}$ ions in the fergusonite and scheelite crystalstructures form a distorted or stretched diamond lattice which is predicted tohost exotic magnetic ground states. In this study, polycrystalline samples ofthe fergusonite orthotantalates $M$-LnTaO$_4$ (Ln = Nd, Sm, Eu, Gd, Tb, Dy, Ho,Er) are synthesized and then characterized using powder diffraction and bulkmagnetometry and heat capacity. TbTaO$_4$ orders antiferromagnetically at 2.25K into a commensurate magnetic cell with $\vec{k}=0$, magnetic space group14.77 ($P2_1$$'/c$) and Tb moments parallel to the $a$-axis. No magnetic orderwas observed in the other materials studied, leaving open the possibility ofexotic magnetic states at $T<2$ K.

Magnetism on the stretched diamond lattice in lanthanide orthotantalates