Study of transport, magnetic and magnetocaloric properties in Sr2+ substituted praseodymium manganite

The magnetotransport, magnetic and magnetocaloric properties in the polycrystalline Pr 1−x Sr x MnO 3 (0.20 ≤ x ≤ 0.40) have been studied. The X-ray diffraction peaks for the composition x = 0.20, 0.33 and 0.40 have been indexed with orthorhombic structure having Pnma space group, whereas x = 0.25 composition has been indexed to R- 3c space group having rhombohedral symmetry. The substitution of Sr 2+ at Pr 3+ site shows an increase in metal-insulator transition temperature (T MI ) and ferromagnetic ordering temperature (T c ). The composition, x = 0.25 shows the higher isothermal magnetic entropy change, Δ S m  = 2.84 J kg −1 K −1 with RCP = 116.33 J kg −1 at ∆H = 3 Tesla. The high RCP value (=151.16 J kg −1 ) with Δ S m  = 2.41 J kg −1 K −1 at ∆H = 3 Tesla for the composition, x = 0.40, implies that δ T f w h m plays a significant role.