Prediction of Magnetocaloric Effect by a Phenomenological Model and Critical Behavior for La0.78Dy0.02Ca0.2MnO3 Compound
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The La0.78Dy0.02Ca0.2MnO3 (LDCMO) compound prepared via high-energy ball-milling (BM) presents a ferromagnetic-to-paramagnetic transition (FM-PM) and undergoes a second-order phase transition (SOFT). Based on a phenomenological model, magnetocaloric properties of the LDCMO compound have been studied. Thanks to this model, we can predict the values of the magnetic entropy change ΔS, the full width at half-maximum δ T FWHM, the relative cooling power (RCP), and the magnetic specific heat change ΔC p for our compound. The significant results under 2 T indicate that our compound could be considered as a candidate for use in magnetic refrigeration at low temperatures. In order to further understand the FM-PM transition, the associated critical behavior has been investigated by magnetization isotherms. The critical exponents estimated by the modified Arrott plot, the Kouvel–Fisher plot, and the critical isotherm technique are very close to those corresponding to the 3D-Ising standard model (β = 0.312 ± 0.07, γ = 1.28 ± 0.02, and δ = 4.80).Those results revealed a long-range ferromagnetic interaction between spins.
KeywordsPerovskite 3D-Ising model Magnetocaloric properties
This work was supported by the Tunisian Ministry of Higher Education and Scientific Research. The magnetic measurements at ESPCI have been supported through grants from Region Ile-de-France.
- 3.Zener, C.: Interaction between d-shells in the transition metals. II. Ferromagnetic compounds of manganese with perovskite structure. Phys. Rev. 82 (1951)Google Scholar
- 9.Stanley, H.E: Introduction to phase transitions and critical phenomena. Oxford University Press, London (1971)Google Scholar
- 12.Suryanarayana, C.: ‘Mechanical alloying and milling’. Prog. Mater. Sci. 46(1), 184 (2001)Google Scholar
- 13.Blazquez, J. S., ipus, J. J., Moreno-Ramirez, L. M., Borrego, J. M., Lozano-Perez, S., FRANCO, V., CONDE, C. F., CONDE, A.: Analysis of the magnetocaloric effect in powder samples obtained by ball milling. Metall. Mater. Trans. E. 2, 136 (2015)Google Scholar
- 14.Riahi, K., Messaoui, I., Cheikhrouhou-Koubaa, W., Mercone, S., Leridon, B., Koubaa, M., Cheikhrouhou, A.: Effect of synthesis route on the structural, magnetic and magnetocaloric properties of La0.78Dy0.02Ca0.2MnO3 manganite: a comparison between sol-gel, high-energy ball-milling and solid state process. J. Alloys. Compd. 688, 1028–1038 (2016)CrossRefGoogle Scholar
- 29.Zhang, P., Lampen, P., Phan, T. L., Yu, S. C., Thanh, T. D., Dan, N. H., Lam, V. D., Srikanth, H., Phan, M. H.: Influence of magnetic field on critical behavior near a first order transition in optimally doped manganites: The case of La1−xCaxMnO3 (0.2x0.4). J. Magn. Magn. Mater. 348, 146 (2013)ADSCrossRefGoogle Scholar
- 39.Zhang, P., Lampen, P., Phan, T. L., Yu, S. C., Thanh, T. D., Dan, N. H., Lam, V. D., Srikanth, H., Phan, M.H.: Influence of magnetic field on critical behavior near a first order transition in optimally doped manganites: The case of La1−xCaxMnO3 (0.2x0.4). J. Magn. Magn. Mater 348, 146 (2013)ADSCrossRefGoogle Scholar