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Synthesis of high-entropy-alloy-type superconductors (Fe,Co,Ni,Rh,Ir)Zr2 with tunable transition temperature

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Abstract

We report on the synthesis and superconductivity of high-entropy-alloy-type (HEA-type) compounds TrZr2 (Tr = Fe, Co, Ni, Rh, Ir), in which the Tr site satisfies the criterion of HEA. Polycrystalline samples of HEA-type TrZr2 with four different compositions at the Tr site were synthesized by arc melting method. The phase purity and crystal structure were examined by Rietveld refinement of X-ray diffraction profile. It has been confirmed that the obtained samples have a CuAl2-type tetragonal structure. From analyses of elemental composition and mixing entropy at the Tr site, the HEA state for the Tr site was confirmed. The physical properties of obtained samples were characterized by electrical resistivity and magnetization measurements. All the samples show bulk superconductivity with various transition temperatures (Tc). The Tc varied according to the compositions and showed correlations with the lattice constant c and Tr–Zr bond lengths. Introduction of an HEA site in TrZr2 is useful to achieve systematic tuning of Tc with a wide temperature range, which would be a merit for superconductivity application.

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Acknowledgements

The authors thank O. Miura for their assistance with the experiments. This work was partly supported by JSPS KAKENHI (Grant Number: 18KK0076) and Tokyo Metropolitan Government Advanced Research (Grant Number: H31-1).

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Authors and Affiliations

  1. Department of Physics, Tokyo Metropolitan University, 1-1, Minami-osawa, Hachioji, 192-0397, Japan

    Md. Riad Kasem, Aichi Yamashita, Yosuke Goto, Tatsuma D. Matsuda & Yoshikazu Mizuguchi

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  1. Md. Riad Kasem
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  2. Aichi Yamashita
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  3. Yosuke Goto
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  4. Tatsuma D. Matsuda
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  5. Yoshikazu Mizuguchi
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Correspondence to Yoshikazu Mizuguchi.

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Kasem, M.R., Yamashita, A., Goto, Y. et al. Synthesis of high-entropy-alloy-type superconductors (Fe,Co,Ni,Rh,Ir)Zr2 with tunable transition temperature. J Mater Sci 56, 9499–9505 (2021). https://doi.org/10.1007/s10853-021-05921-2

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