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

Abstract

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, $\left|{\rm{\Delta }}{{\rm{S}}}_{{\rm{m}}}\right|$ = 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 $\left|{\rm{\Delta }}{{\rm{S}}}_{{\rm{m}}}\right|$ = 2.41 J kg ^−1 K ^−1 at ∆H = 3 Tesla for the composition, x = 0.40, implies that $\delta {T}_{fwhm}$ plays a significant role.

Keywords

• praseodymium strontium manganite (PrSrMnO3)
• magnetoresistance
• magnetic entropy