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

Abstract

The magnetotransport, magnetic and magnetocaloric properties in the polycrystalline Pr1-xSrxMnO3 (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 Sr2+ at Pr3+site shows an increase in metal-insulator transition temperature (TMI) and ferromagnetic ordering temperature (Tc). The composition, x = 0.25 shows the higher isothermal magnetic entropy change, |Δ Sm = 2.84 J kg-1K-1 with RCP = 116.33 J kg-1 at H = 3 Tesla. The high RCP value (=151.16 J kg-1) with |Δ Sm = 2.41 J kg-1 K-1 at H = 3 Tesla for the composition, x = 0.40, implies that δTfwhm plays a significant role.