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Magnetocaloric effect in Mn1−x CoGeSi x alloys

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Abstract

A comprehensive study of the magnetic transition, magnetocaloric effect, critical behavior, and universal behavior for Mn1−x CoGeSi x (x = 0.02, 0.04, 0.06, and 0.08) system is reported. The Curie temperature increases from 270 to 289 K as the Si doping increases, while the maximum magnetic entropy change (|ΔS M|) decreases from 3.08 to 2.67 J/kg K (5 T), consistent with the shift of magnetic moment. Various techniques are used to determine the critical exponents and confirm the validity of the obtained critical exponents, revealing long-range interactions in this system. The Landau theory and universal behavior are used to evidence the second-order nature of the transition. Moreover, the new method to estimate the spontaneous magnetization estimated from the magnetic entropy change is verified.

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Acknowledgements

This work is supported by Natural Science Foundation of China (Nos. 11674215, 11374204), “ShuGuang” project of Shanghai Municipal Education Commission and Shanghai Education Development Foundation (No. 13SG52), and Project of Science and Technology Commission of Shanghai Municipality (No. 14520501000).

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Authors and Affiliations

  1. Institute of Solar Energy, Shanghai University of Electric Power, Shanghai, 200090, China

    Xiaodong Si, Yongsheng Liu, Yulong Shen, Wenying Yu, Xinxiu Ma, Zhanxian Zhang, Yan Xu & Tian Gao

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  1. Xiaodong Si
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  2. Yongsheng Liu
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Correspondence to Yongsheng Liu.

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Si, X., Liu, Y., Shen, Y. et al. Magnetocaloric effect in Mn1−x CoGeSi x alloys. J Mater Sci 53, 3661–3671 (2018). https://doi.org/10.1007/s10853-017-1783-1

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