高熵合金型过渡金属锆(Fe,Co,Ni,Cu,Ga)Zr2的超导性

IF 2.9 4区物理与天体物理 Q2 OPTICS

Journal of Nonlinear Optical Physics & Materials Pub Date : 2022-07-14 DOI:10.1088/2515-7639/ac8e34

M. R. Kasem, H. Arima, Y. Ikeda, A. Yamashita, Y. Mizuguchi

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引用次数: 2

摘要

我们合成了一种新的高熵合金型(hea型)超导体(Fe,Co,Ni,Cu,Ga)Zr2，温度为2.9 K。EDX分析表明，过渡金属位点(Tr-site)的实际组成为Tr = Fe0.17(1)Co0.18(2)Ni0.21(2)Cu0.25(1)Ga0.19(1)，得到Tr位点的混合构型熵ΔS mix = 1.60 R。中子粉末衍射结果表明，样品为四边形cual2型(空间群:#140)。a的晶格常数随温度的降低而单调减小，而c的晶格常数没有明显的收缩。Tr和Zr位点的各向同性位移参数都很大，这可能是hea型Tr位点造成的。U iso对两个位置的温度依赖性都很小，这也表明(Fe,Co,Ni,Cu,Ga)Zr2中存在局部结构紊乱。通过电阻率、磁化率和比热测量，证实了块体超导性。

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Superconductivity of high-entropy-alloy-type transition-metal zirconide (Fe,Co,Ni,Cu,Ga)Zr2

We synthesized a new high-entropy-alloy-type (HEA-type) superconductor (Fe,Co,Ni,Cu,Ga)Zr2 with a T c of 2.9 K. The EDX analyses revealed that the actual composition of the transition-metal site (Tr-site) is Tr = Fe0.17(1)Co0.18(2)Ni0.21(2)Cu0.25(1)Ga0.19(1), which gives the configurational entropy of mixing ΔS mix = 1.60 R for the Tr site. Neutron powder diffraction revealed that the sample has a tetragonal CuAl2-type (space group: #140). The lattice constant of a monotonically decreases with decreasing temperature, but the lattice constant of c does not exhibit a clear shrinkage. Isotropic displacement parameter for both the Tr and Zr sites are large, which is probably caused by the HEA-type Tr site. The small temperature dependences of U iso for both sites also indicate the presence of the local structural disorder in (Fe,Co,Ni,Cu,Ga)Zr2. From electrical resistivity, magnetic susceptibility, and specific heat measurements, bulk superconductivity was confirmed.

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来源期刊

Journal of Nonlinear Optical Physics & Materials 物理-光学

CiteScore

3.00

自引率

48.10%

发文量

审稿时长

3 months

期刊介绍： This journal is devoted to the rapidly advancing research and development in the field of nonlinear interactions of light with matter. Topics of interest include, but are not limited to, nonlinear optical materials, metamaterials and plasmonics, nano-photonic structures, stimulated scatterings, harmonic generations, wave mixing, real time holography, guided waves and solitons, bistabilities, instabilities and nonlinear dynamics, and their applications in laser and coherent lightwave amplification, guiding, switching, modulation, communication and information processing. Original papers, comprehensive reviews and rapid communications reporting original theories and observations are sought for in these and related areas. This journal will also publish proceedings of important international meetings and workshops. It is intended for graduate students, scientists and researchers in academic, industrial and government research institutions.