Synthesis, magnetic and magnetocaloric properties of transition element doped La0.67Ba0.33MnO3.

Colossal magnetoresistance materials have demonstrated large changes in resistance in the presence of magnetic fields. In the current work, a group of such materials, with the compositional formula La_0.67Ba_0.33MnO₃ and 10% Fe, Co, Ni, Zn doped La_0.67Ba_0.33MnO₃ have been prepared by conventional solid-state method. Structural analysis has been carried out by X-Ray diffraction method followed by Rietveld analysis. Magnetic transition between ferromagnetism to paramagnetism has been observed from the magnetic characterizations. Parameters such as Curie temperature (θ_P) and effective magnetic moment (µ_eff) are obtained from susceptibility analysis subject to Curie–Weiss law. Furthermore, magnetocaloric nature of the samples is examined from the M-H isotherms. Using Maxwell's relations, isothermal entropy change, ∆S_max are determined to check whether the prepared samples can be used for magnetic refrigeration around the room temperature. [ABSTRACT FROM AUTHOR]