Abstract
We have investigated structural, magnetic and magnetocaloric properties of polycrystalline samples La0.5-x Eux Ca0.5 MnO3 (x=0 and 0.1). Rietveld refinement of the X-ray diffraction patterns show that our samples are single phase and crystallize in the orthorhombic structure with Pnma space group. Magnetization measurements versus temperature at a magnetic applied field of 500 Oe indicate that La0.4 Eu0.1 Ca0.5 MnO3 sample exhibits a paramagnetic to ferromagnetic transition with decreasing temperature. Magnetic measurements reveal strong magnetocaloric effect in the vicinity of the Curie temperature TC . The parent compound shows a negative magnetic entropy change of ∆SM =−1.13Jkg−1 K−1 at 220K and a positive magnetocaloric effects ∆SM =1Jkg−1 K−1 at 150K under a magnetic applied field of 2T. La0.4 Eu0.1 Ca0.5 MnO3 exhibits a maximum value of magnetic entropy change ∆SM =−1.15Jkg−1 K−1 at 130K under an applied field of 2T and a large relative cooling power RCP with a maximum value of 72 J/kg.
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