We report the magnetic and magnetocaloric properties of the tetragonal rare-earth compound DyRu 2 Si 2 under applied hydrostatic pressure. The isothermal entropy change (DS) and the adiabatic temperature change (DT ad ) were calculated from magnetization data collected at different applied pressures and from heat capacity measurements conducted at atmospheric pressure, respectively. The application of hydrostatic pressure significantly modified the multi-step magnetization curve and the

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... on magnetization. A suppression of the magnetization was observed for P ¼ 0.588 GPa and P ¼ 0.654 GPa whereas, at about P %1 GPa, the saturation magnetization increased and the magnetization isotherms again resembled the curves measured at atmospheric pressure. A small thermal hysteresis was observed between the heating and cooling M(T) curves at T t ¼ 3:4 K, with an applied magnetic field of H ¼ 0.1 T. This thermal hysteresis indicates a firstorder like transition which was also supported by the Arrott plot analysis. The volume magnetostriction was estimated from the pressure-dependent magnetization measurements using a Maxwell relation.