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Magnetic properties and critical behavior of electron doped polycrystalline Ca0.85Sm0.15MnO3 manganite

We have reported the magnetic properties and critical behavior of electron doped Ca0.85Sm0.15MnO3 (CSMO) sample prepared by solid state reaction technique. With increasing temperature the CSMO sample undergoes ferromagnetic to paramagnetic phase transition at 115 K. The positive value of the Landau coefficient b(T) estimated from the fitting of magnetization data with equation of state suggests that the CSMO sample undergoes 2nd order magnetic phase transition. The positive slopes of Arrott plots corroborate the same. Further study of the critical behavior of the CSMO sample was done by analysis of Kouvel–Fisher plot and critical isotherm. The calculated values of the critical exponents β , γ and δ differ significantly from the values which correspond to three dimensional mean field, tri-critical mean field, 3D Ising and 3D Heisenberg models. This indicates the nonconventional nature of ferromagnetism induced in the CSMO sample by Sm doping at the Ca site.