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Magnetostructural Coupling and Giant Magnetocaloric Effect in Off-Stoichiometric MnCoGe Alloys

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Abstract

The magnetostructural coupling in off-stoichiometric MnCoGe alloys is realized within a wide Curie temperature window (up to 96 K) through tuning the Mn/Co ratio and it results in a significant entropy change (up to − 30.8 J K−1 kg−1). Two scenarios have been studied, i.e. the Co- and Mn-rich compositions, respectively. In both scenarios, the orthorhombic-hexagonal structural transition temperature can be shifted into the temperature range between the Curie temperatures of the orthorhombic and hexagonal phases, enabling the magnetostructural coupling between two phases. Although the magnetostructural coupling can be achieved in both scenarios, the Co-rich alloys show a much higher entropy change and a wider Curie-temperature window than the Mn-rich alloys. Based on the systematic structural and magnetic analyses, the composition-dependent phase diagrams for both scenarios have been constructed.

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Funding

This work was sponsored by the National Natural Science Foundation of China (Grant Nos.: 51571121 and 11604148); the Natural Science Foundation of Jiangsu Province (Grant No: BK20140035); the Postdoctoral Science Foundation Funded Project of Jiangsu Province (Grant No: 1601268C) and the Qing Lan Project of Jiangsu Province.

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Authors and Affiliations

  1. MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials Technology, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China

    Najam ul Hassan, Ishfaq Ahmad Shah, Jun Liu, Guizhou Xu, Yuanyuan Gong, Xuefei Miao & Feng Xu

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  1. Najam ul Hassan
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  2. Ishfaq Ahmad Shah
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  3. Jun Liu
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  4. Guizhou Xu
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  6. Xuefei Miao
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  7. Feng Xu
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Correspondence to Feng Xu.

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ul Hassan, N., Shah, I.A., Liu, J. et al. Magnetostructural Coupling and Giant Magnetocaloric Effect in Off-Stoichiometric MnCoGe Alloys. J Supercond Nov Magn 31, 3809–3815 (2018). https://doi.org/10.1007/s10948-018-4655-2

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