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<p>This research investigates the effects of Eu<sup>3+</sup> doping on the structural, magnetic, and magnetocaloric properties of La<sub>0.67−<i>x</i></sub>Eu<sub><i>x</i></sub>Ba<sub>0.33</sub>MnO<sub>3</sub> (<i>x</i> = 0, 0.05, 0.10) prepared by the sol–gel method. All samples crystallized in the single phase of rhombohedral R−3c structure. Increased doping induces lattice distortion, lengthening the Mn–O bond and reducing the Mn–O–Mn bond angle, which weakens the double-exchange interaction and thereby reduces the Curie temperature <i>T</i><sub>C</sub> and the magnetic entropy change. The composition with <i>x</i> = 0.05 (<i>T</i><sub>C</sub> = 312&#xa0;K) exhibits a maximum magnetic entropy change of 2.18&#xa0;J&#xa0;kg<sup>−1</sup>&#xa0;K<sup>−1</sup> under the magnetic field of 2&#xa0;T, showing superior near room temperature magnetocaloric performance to many other reported manganites. Furthermore, the doping introduces quenched disorder, leading to the formation of Griffiths-like phases. Critical behavior analysis reveals a crossover from mean-field model to non-universal behavior for <i>x</i> = 0.10, which is attributed to local magnetic inhomogeneities and Griffiths-like phases that broaden the magnetic transition and consequently flatten the magnetic entropy change curve.</p>

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Evolution of critical behavior and magnetocaloric effect in Eu doped La0.67Ba0.33MnO3 perovskites

  • 期刊论文

  • 发表日期：

    2026年5月9日

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  • Huiyan Zhang,
  • Fucheng Zhu,
  • Yang Xu,
  • Liangjun Qian,
  • Kewen Qiu,
  • Hailing Li,
  • Weihua Gu,
  • Zhiyuan Liu,
  • Juan Liu,
  • Ailin Xia

摘要

This research investigates the effects of Eu3+ doping on the structural, magnetic, and magnetocaloric properties of La0.67−xEuxBa0.33MnO3 (x = 0, 0.05, 0.10) prepared by the sol–gel method. All samples crystallized in the single phase of rhombohedral R−3c structure. Increased doping induces lattice distortion, lengthening the Mn–O bond and reducing the Mn–O–Mn bond angle, which weakens the double-exchange interaction and thereby reduces the Curie temperature TC and the magnetic entropy change. The composition with x = 0.05 (TC = 312 K) exhibits a maximum magnetic entropy change of 2.18 J kg−1 K−1 under the magnetic field of 2 T, showing superior near room temperature magnetocaloric performance to many other reported manganites. Furthermore, the doping introduces quenched disorder, leading to the formation of Griffiths-like phases. Critical behavior analysis reveals a crossover from mean-field model to non-universal behavior for x = 0.10, which is attributed to local magnetic inhomogeneities and Griffiths-like phases that broaden the magnetic transition and consequently flatten the magnetic entropy change curve.