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<p>The study investigated non-crystalline Eu<sub>80</sub>Au<sub>20</sub> alloy prepared by liquid quenching with the piston and anvil technique. Magnetization measurements were conducted over a temperature range of 4.2 to 200&#xa0;K under magnetic fields reaching up to 4.5 T. The shift from the ferromagnetic to the paramagnetic (FM/PM) state was recognized as a 2<sup>nd</sup> order magnetic phase transition. The Temperature average Entropy Change (TEC) was measured under magnetic fields between 1 and 4 T, with ΔT<sub>lift</sub> varying between 10 and 100&#xa0;K. Additionally, theoretical models, particularly those based on mean field theory (MFT), anticipate a power-law correlation between entropy change and magnetic field strength near T<sub>C</sub>. However, experimental data for Eu<sub>80</sub>Au<sub>20</sub> shows deviations from MFT predictions, with a local exponent <i>n</i> ≈ 0.73. This discrepancy suggests the presence of magnetic inhomogeneities, highlighting the limitations of MFT in describing disordered systems.</p>

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Investigation of Non-Crystalline Eu80Au20 alloy: magnetization measurements and entropy change analysis

  • 期刊论文

  • 发表日期：

    2025年6月11日

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  • S. El Ouahbi,
  • M. Lassri,
  • M. Sajieddine,
  • H. Lassri

摘要

The study investigated non-crystalline Eu80Au20 alloy prepared by liquid quenching with the piston and anvil technique. Magnetization measurements were conducted over a temperature range of 4.2 to 200 K under magnetic fields reaching up to 4.5 T. The shift from the ferromagnetic to the paramagnetic (FM/PM) state was recognized as a 2nd order magnetic phase transition. The Temperature average Entropy Change (TEC) was measured under magnetic fields between 1 and 4 T, with ΔTlift varying between 10 and 100 K. Additionally, theoretical models, particularly those based on mean field theory (MFT), anticipate a power-law correlation between entropy change and magnetic field strength near TC. However, experimental data for Eu80Au20 shows deviations from MFT predictions, with a local exponent n ≈ 0.73. This discrepancy suggests the presence of magnetic inhomogeneities, highlighting the limitations of MFT in describing disordered systems.