Room temperature magnetocaloric effect in Pr1.75Sr1.25Mn2O7 double-layered perovskite manganite system

In this work, we have studied on double-layered perovskite (Ruddlesden-Popper) manganite structure in Pr1.75Sr1.25Mn2O7 synthesised by sol-gel method. The crystal structure of the double-layered perovskite is found as tetragonal from the X-ray diffraction analysis with I4/mmm space group. A high Curie temperature, T-C=305 K is observed from the temperature dependence of magnetisation measurement. The isothermal magnetisation curves showed that magnetic phase transition is second order due to the positive slope of the Arrott plots. Maximum magnetic entropy change (S-M) and adiabatic temperature change (T-ad) values are calculated as 3.99 J kg(-1) K-1 and 2.1 K under external magnetic field of 70 kOe, respectively. Since our double-layered perovskite manganite sample has desired T-C value and relatively high S-M, it can be a potential candidate as a magnetocaloric material for room temperature magnetic cooling systems.