The influence of hydrostatic pressure on the meta-magnetic transition and magnetocaloric properties of DyRu$_{\mathrm{2}}$Si$_{\mathrm{2}}$.

We have studied the magnetic and magnetocaloric properties of the tetragonal rare-earth compound DyRu$_{\mathrm{2}}$Si$_{\mathrm{2}}$ as a function of applied hydrostatic pressure. At atmospheric pressure, transitions were observed at T$_{\mathrm{t}} \quad =$ 3.4 K and T$_{\mathrm{N}} \quad =$ 29.2 K. The isothermal entropy change ($\Delta $S) and the adiabatic temperature change ($\Delta $T$_{\mathrm{ad}})$ were calculated from magnetization data collected at different applied pressures and from heat capacity measurements conducted at atmospheric pressure, respectively. A suppression of the magnetization was observed for P $=$ 0.588 GPa and P $=$ 0.654 GPa . Multi-step meta-magnetic-transitions as were observed at atmospheric pressure, were not present at these pressure values. For P $\approx $ 1 GPa, the saturation magnetization increased, and the multi-step meta-magnetic transitions reappeared. This trend of pressure dependence was also apparent in the isothermal entropy change ($\Delta $S) versus temperature (T) curves. Using a Maxwell relation, we estimated the volume magnetostriction from the pressure dependent magnetization measurements.