Critical phenomena and estimation of the spontaneous magnetization by the analysis of the magnetic entropy change for the Nd0.6Sr0.3Ca0.1Mn0.975Fe0.025O3 manganite

• Published in: Journal of molecular structure 2017-02, Vol.1130, p.71-79
• Main Authors: Laouyenne, M.R., Baazaoui, M., Mahjoub, Sa, Hlil, E.K., Oumezzine, M.
• Format: Article
• Language: English
• Subjects: Critical phenomena; Magnetic entropy change
• ISSN: 0022-2860; 1872-8014
• DOI: 10.1016/j.molstruc.2016.10.020

In this actual work, we have already studied the universal critical behavior in perovskite-manganite compound Nd0.6Sr0.3Ca0.1Mn0.975Fe0.025O3. An approve of a second order ferromagnetic-paramagnetic phase transition through the magnetic measurements using Banerjee's criteria is completely clarified. The critical exponents values near the critical point TC are determined through several techniques such as modified Arrott plot (MAP), Kouvel Fisher (KF) method and critical isotherm (CI). The critical exponents values obtained agree toughly with the mean field model (β = 0.478 ± 0.01 with TC = 232 K ± 0.9 K and γ = 1.039 ± 0.02 with TC = 230 K ± 0.94 K). We have confirmed the obtained critical exponents with the single scaling equation of: M(H,ε)=εβf±(H/ε(β+γ)) With ε = (T−TC)/TC is the reduced temperature. We have verified the agreement between two different methodologies of determining the spontaneous magnetization (MS) in Nd0.6Sr0.3Ca0.1Mn0.975Fe0.025O3 manganite. Used the spontaneous magnetization (MS) obtained through the magnetic entropy change (ΔSM) vs M2; we have fitted MS(T) curves to obtain an excellent agreement between the theoretical and experimental value of β. This result leads to confirm the validity of the magnetic entropy change approach in order to estimate the spontaneous magnetization MS in a ferromagnetic system. [Display omitted] •The compound undergoes a second order phase transition from ferromagnetic to paramagnetic state.•The critical exponents values agree strongly with that of Mean field model.•A wonderful magnitude coincidence between the magnetic entropy change using the Maxwell relation and the Landau theory.•The perfect estimation of β by the Landau theory ensure the validly of this technique to calculate β exponent value.