Abstract
The critical behavior and its relation to the magnetocaloric effect in the amorphous Eu80Au20 alloy prepared by the melt-quenching technique are studied in detail. At 4.2 K, the magnetic moment is found to be 6.6 µB/Eu2+ ion (at µ0H = 4 T), which is smaller than the theoretical value of 7 µB/Eu2+ ion, indicating a misalignment of moments. The Curie-Weiss temperature (θP) and experimental effective magnetic moment \(\left( {\mu_{{{\text{eff}}}}^{{{\text{exp}}}} } \right)\) are deduced from the Curie-Weiss law. The magnetic transition from the ferromagnetic state to the paramagnetic state was found to be a second-order magnetic phase transition. The critical exponents (CEs) in amorphous Eu80Au20 alloy are explored around its Curie temperature (TC) and are examined using a variety of techniques, including the modified Arrott plot, the Widom scaling relation, critical isotherm analysis, and the Kouvel-Fisher method. The computed values of the CEs agreed with those predicted by the mean-field approach. Based on these results, one may be able to conclude that the ferromagnetic exchange interaction is the long-range type.
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Lassri, M., El Ouahbi, S., Sajieddine, M. et al. Investigation of the Correlation Between the Critical Behavior and the Magnetocaloric Effect of Amorphous Eu80Au20 Alloy. J. Electron. Mater. 52, 6080–6088 (2023). https://doi.org/10.1007/s11664-023-10539-y
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DOI: https://doi.org/10.1007/s11664-023-10539-y