Magnetic, magnetocaloric and critical behavior investigation of La0.69Dy0.01Ca0.3MnO3

Magnetic, magnetocaloric and critical behavior properties of La 0.69 Dy 0.01 Ca 0.3 MnO 3 are studied. The Rietveld refinements of the X-ray diffraction patterns show that our sample crystallizes in the orthorhombic structure with Pnma space group. The Curie temperature is found to be 245 K. In the vicinity of T C , |-ΔS M | reached, in a magnetic applied field of 5T, maximum value of 14.94 J kg −1 K −1 . The critical exponents β, γ and δ have been determined using various techniques such as the modified Arrott plot, Kouvel–Fisher methods as well as the critical isotherm, and are found to be β = 0.25 at T C = 246.74 K and γ = 0.87 at T C = 246.2 K for La 0.69 Dy 0.01 Ca 0.3 MnO 3 . The values of critical exponents are close to the tri-critical mean-field model.