Synthesis of high-entropy-alloy-type superconductors (Fe,Co,Ni,Rh,Ir)Zr2 with tunable transition temperature
Synthesis of high-entropy-alloy-type superconductors (Fe,Co,Ni,Rh,Ir)Zr2 with tunable transition temperature
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DOI：
10.1007/s10853-021-05921-2
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发表时间：
2021-02-18
影响因子：
4.5
通讯作者：
Mizuguchi, Yoshikazu
中科院分区：
文献类型：
--
作者：
Kasem, Md. Riad;Yamashita, Aichi;Mizuguchi, Yoshikazu
本文报道了高熵合金型（HEA型）化合物TrZr_2（Tr = Fe，Co，Ni，Rh，Ir）的合成和超导电性，其中Tr位满足HEA判据。采用电弧熔炼法合成了四种不同组成的HEA型TrZr_2多晶样品。用Rietveld精修的X-射线衍射谱分析了相纯度和晶体结构。已经证实，所获得的样品具有CuAl 2型四方晶系结构。从元素组成和混合熵的分析在Tr网站，HEA状态的Tr网站被确认。通过电阻率和磁化强度测量表征所获得的样品的物理性质。所有的样品都具有不同的转变温度（T-c）的体超导电性。T-c随组成的不同而变化，并与晶格常数c和Tr-Zr键长相关。在TrZr 2中引入HEA位置有助于在宽温度范围内实现T-c的系统调谐，这将是超导应用的优点。
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 (T-c). The T-c 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 T-c with a wide temperature range, which would be a merit for superconductivity application.