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<p>This study systematically investigates how A-site doping with ions of varying radii (Gd, Sm, Nd) tunes the structure and magnetocaloric properties of Ruddlesden-Popper phase La<sub>1.3</sub><i>A</i><sub>0.1</sub>Sr<sub>1.6</sub>Mn<sub>2</sub>O<sub>7</sub>. Rietveld refinement confirms a tetragonal structure (I4/mmm). FT-IR and XRD reveal doping-induced lattice distortions and octahedral alterations. XPS confirms the Mn<sup>4+</sup>/Mn<sup>3+</sup> ratio of 0.42, optimizing electronic interactions. The Curie temperature decreases with decreasing ionic radius: Tc = 83.11&#xa0;K (Nd), 75.21&#xa0;K (Sm), 66.90&#xa0;K (Gd). The magnetic entropy change reaches 3.02&#xa0;J/(kg·K) for Sm doping at 5 T, and a relative cooling power of 217.43&#xa0;J/kg is achieved for Gd. Critical behavior follows the mean-field model, indicating long-range magnetic order. These results demonstrate that ionic radius-controlled lattice distortion is an effective strategy for enhancing magnetocaloric performance in Ruddlesden-Popper manganites.</p>

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Magnetocaloric performance and critical scaling of doped La1.4Sr1.6Mn2O7 manganites

  • 期刊论文

  • 发表日期：

    2026年1月20日

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  • Xiuxin Zheng,
  • Min Feng,
  • Zhuojia Xie,
  • Lin Gong,
  • Zhengguang Zou

摘要

This study systematically investigates how A-site doping with ions of varying radii (Gd, Sm, Nd) tunes the structure and magnetocaloric properties of Ruddlesden-Popper phase La1.3A0.1Sr1.6Mn2O7. Rietveld refinement confirms a tetragonal structure (I4/mmm). FT-IR and XRD reveal doping-induced lattice distortions and octahedral alterations. XPS confirms the Mn4+/Mn3+ ratio of 0.42, optimizing electronic interactions. The Curie temperature decreases with decreasing ionic radius: Tc = 83.11 K (Nd), 75.21 K (Sm), 66.90 K (Gd). The magnetic entropy change reaches 3.02 J/(kg·K) for Sm doping at 5 T, and a relative cooling power of 217.43 J/kg is achieved for Gd. Critical behavior follows the mean-field model, indicating long-range magnetic order. These results demonstrate that ionic radius-controlled lattice distortion is an effective strategy for enhancing magnetocaloric performance in Ruddlesden-Popper manganites.