Pressure influence on magnetic properties of Nd2RhIn8

• Hydrostatic and uniaxial pressure along the c-axis cause an increase of TN.
• The ground state magnetic structure is stabilized with decreasing Nd-Nd distances.
• The change of TN is related to change of structural and crystal-field parameters.

We have studied the pressure effect on the magnetic phase diagram of tetragonal Nd2RhIn8. The magnetization under uniaxial pressure up to 5.3 kbar applied along the tetragonal c-axis and the heat capacity under hydrostatic pressure were measured in magnetic fields up to 7 and 14 T, respectively. Both types of measurements reveal an increase of TN with increasing pressure; the effect is considerably stronger for the uniaxial pressure. Considering also the anisotropic compressibility in this family of compounds, we conclude that TN increases with decreasing c/a. The phase boundary between the ground-state AF1 phase and the field-induced AF2 phase shifts slightly to higher magnetic fields with increasing pressure. The ground state phase is thus stabilized by applying pressure. The magnetic phase diagram is constructed.