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<p>This work presents a comprehensive mean-field theory (MFT) analysis of the magnetic and thermodynamic behavior of La<sub>0.6</sub>Dy<sub>0.1</sub>Sr<sub>0.3</sub>Mn<sub>-x</sub>Bi<sub>x</sub>O<sub>3</sub> <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\((\text{x }= 0, 0.01, 0.03, 0.1)\)</EquationSource> </InlineEquation> manganites. The isothermal magnetizations <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\text{M}(\text{H},\text{T})\)</EquationSource> </InlineEquation> were modeled using the Brillouin function incorporating an effective exchange field which is found to vary linearly with magnetization across all compositions. The estimated critical exponent <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(\upbeta\)</EquationSource> </InlineEquation> and spontaneous magnetization determined via both magnetocaloric entropy and Arrott plots, align closely with mean-field predictions. The theoretical <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\(\text{M}(\text{H},\text{T})\)</EquationSource> </InlineEquation> and magnetic entropy change curves, calculated via MFT, show good agreement with experimental measurements, especially at high fields. However, deviations at low fields and near criticality suggest limitations of the MFT approach due to local inhomogeneities and critical fluctuations.</p>

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Mean-field analysis of magnetic and entropy properties in Bi-doped La0.6Dy0.1Sr0.3MnO3 manganites

  • 期刊论文

  • 发表日期：

    2026年2月9日

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  • Salha Khadhraoui,
  • Houda Kaouach,
  • Amel Haouas

摘要

This work presents a comprehensive mean-field theory (MFT) analysis of the magnetic and thermodynamic behavior of La0.6Dy0.1Sr0.3Mn-xBixO3 \((\text{x }= 0, 0.01, 0.03, 0.1)\) manganites. The isothermal magnetizations \(\text{M}(\text{H},\text{T})\) were modeled using the Brillouin function incorporating an effective exchange field which is found to vary linearly with magnetization across all compositions. The estimated critical exponent \(\upbeta\) and spontaneous magnetization determined via both magnetocaloric entropy and Arrott plots, align closely with mean-field predictions. The theoretical \(\text{M}(\text{H},\text{T})\) and magnetic entropy change curves, calculated via MFT, show good agreement with experimental measurements, especially at high fields. However, deviations at low fields and near criticality suggest limitations of the MFT approach due to local inhomogeneities and critical fluctuations.