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arXiv 2102.12271cond-mat.supr-con
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新型高熵合金型Nb3(Al,Sn,Ge,Ga,Si)超导体的合成

Synthesis of new high-entropy alloy-type Nb3 (Al, Sn, Ge, Ga, Si) superconductors

Aichi Yamashita, Tatsuma D. Matsuda, Yoshikazu Mizuguchi

摘要:

近年来,高熵合金(HEA)超导体的研究日益增多,特别是在材料科学和凝聚态物理领域。为了对新的HEA型超导体的研究做出贡献,在我们的研究中,我们通过电弧熔化合成了具有HEA型位置的Nb3Al0.2Sn0.2Ge0.2Ga0.2Si0.2(#1)和Nb3Al0.3Sn0.3Ge0.2Ga0.1Si0.1(#2)的A15型超导体的多晶样品。元素和结构分析表明,所得样品的组成满足HEA状态标准。超导转变观察到在9.0和11.0 K的#1和#2,分别在磁化强度和电阻率的温度依赖性。比热测量结果表明,样品的Sommerfeld系数、德拜温度和ΔC/γTc与传统Nb 3Sn系列超导体的结果接近。

英文摘要:

Studies on high-entropy alloy (HEA) superconductors have recently been increasing, particularly in the fields of materials science and condensed matter physics. To contribute to research on new HEA-type superconductors, in our study we synthesized polycrystalline samples of A15-type superconductors of Nb3Al0.2Sn0.2Ge0.2Ga0.2Si0.2 (#1) and Nb3Al0.3Sn0.3Ge0.2Ga0.1Si0.1 (#2) with an HEA-type site by arc melting. Elemental and structural analyses revealed that the compositions of the obtained samples satisfied the HEA state criteria. Superconducting transitions were observed at 9.0 and 11.0 K for #1 and #2, respectively, in the temperature dependence of magnetization and electrical resistivity. Specific heat measurements revealed that the Sommerfeld coefficient, Debye temperature, and ΔC/γTc for the obtained samples were close to those reported for conventional Nb3Sn family superconductors.

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