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Magnetic Properties and Magnetic Entropy Changes of Eu-Doped La0.9Sr0.1MnO3 Perovskite Manganese Oxides

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Abstract

Polycrystalline samples of La0.9−xEuxSr0.1MnO3 (x = 0.00, 0.05) were prepared using the standard solid-state reaction method. The effects of Eu3+ doping on the magnetic properties, magnetic entropy changes, and critical behaviors of La0.9Sr0.1MnO3 polycrystalline samples were systematically investigated. Preformed cluster phases were present in both samples in the temperature ranges of 118–326 K and 121–329 K, respectively. Additionally, near the Curie temperature (TC), the samples exhibited a second-order transition. The critical behaviors of the two samples were best fitted with the mean field model. The maximum magnetic entropy changes \( \left| {\Delta S_{\text{M}} } \right| \) of the two tested samples at 7 T near TC were 2.76 J K−1 kg−1 and 2.53 J K−1 kg−1, respectively; in addition, their relative cooling power was 425.28 J kg−1 and 354.93 J kg−1, respectively. The maximum magnetic entropy change calculated from the fitted data was in close agreement with the experimental data. These results indicate that the samples have the potential to realize magnetic refrigeration in the high-temperature regime (T > 77 K).

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Authors and Affiliations

  1. Key Laboratory of Magnetism and Magnetic Materials at Universities of Inner Mongolia Autonomous Region, Baotou Teachers College, Baotou, 014030, China

    Xiang Jin, Yi Lu, Yunbin Sun, Hongye Wu, Xiaodong Sun, Fengze Cao, Hongwei Chen, Bao Xu & Jianjun Zhao

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  1. Xiang Jin
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  2. Yi Lu
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  3. Yunbin Sun
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  4. Hongye Wu
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  5. Xiaodong Sun
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  6. Fengze Cao
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  7. Hongwei Chen
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  8. Bao Xu
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  9. Jianjun Zhao
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Correspondence to Jianjun Zhao.

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This project was supported by the State Key Development Program for Basic Research of China (Grant Nos. 11164019, 51562032, and 61565013), the Inner Mongolia Natural Science Foundation (Grant No. 2015MS0109), the Research Program of Sciences at the Universities of Inner Mongolia Autonomous Region of China (Grant Nos. NJZZ11166, NJZY 16237, and NJZY12202), and the Young Science and Technology Foundation of Baotou Teachers College (Grant No. BSYKJ2014–22).

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Jin, X., Lu, Y., Sun, Y. et al. Magnetic Properties and Magnetic Entropy Changes of Eu-Doped La0.9Sr0.1MnO3 Perovskite Manganese Oxides. J Low Temp Phys 195, 403–418 (2019). https://doi.org/10.1007/s10909-019-02171-0

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