High-field magnetization and magnetic phase diagrams in Nd₂RhIn₈ and Tb₂RhIn₈

We present magnetic phase diagrams of Nd₂RhIn₈ and Tb₂RhIn₈ determined by magnetization and magnetoresistivity measurements on single crystals, including high-field magnetization up to 60 T. Both compounds order antiferromagnetically with the c-axis as the easy magnetization axis. Their magnetic Phase diagrams are qualitatively rather similar. At low temperatures up to 1/2T_N, when applying the field along the tetragonal c-axis, we observe first-order transition to another magnetic phase prior to transition to the ferromagnetic order. The magnetic phase diagrams resemble those of other R₂RhIn₈ or RRhIn₅ compounds.