The results of neutron-diffraction measurements are reported which confirm that superconducting Tm${\mathrm{Rh}}_4$${\mathrm{B}}_4$ orders magnetically at $T_M\simeq 0.7$ K. The modulated antiferromagnetic structure deduced from the data is of particular interest, considering the similarity of certain other physical properties of Tm${\mathrm{Rh}}_4$${\mathrm{B}}_4$ to those of the ferromagnetic, reentrant superconductor Er${\mathrm{Rh}}_4$${\mathrm{B}}_4$.

• Received 15 October 1982

DOI:https://doi.org/10.1103/PhysRevB.27.2889