Investigation on Magnetic and Magnetocaloric Properties of DySe2

The magnetization measurements have been performed to bring out the magnetic and magnetocaloric properties of polycrystalline DySe2 system synthesized by solid state reaction and duly characterized by X-ray diffraction. Room temperature XRD analysis reveals tetragonal structure for this system. Temperature-dependent magnetization measurements display paramagnetic to antiferromagnetic transition at the Neel temperature (T-N) similar to 4.7 K. The T-N exhibits systematic decrease with increase in magnetic field. Isothermal magnetization data exhibits a field-induced meta-magnetic transition below T-N. The onset magnetic field for the meta-magnetic transition decreases with increase in temperature. Arrot plot analysis reveals that both the paramagnetic to antiferromagnetic and the meta-magnetic transitions are first order in nature. Isothermal magnetic entropy change (Delta S) with temperature exhibits negative nonmonotonic behavior with a peak (Delta S-max) for field change Delta H > 10 kOe. The value of Delta S-max is found to be similar to 11.7 J/kg-K for a field change of 70 kOe.