Superconductivity with large upper critical field in noncentrosymmetric Cr-bearing high-entropy alloys

被引：10
作者：
Xiao, Guorui [1 ,2 ,3 ]
Yang, Wuzhang [1 ,2 ,4 ]
Zhu, Qinqing [1 ,2 ,4 ]
Song, Shijie [3 ]
Cao, Guang-Han [3 ]
Ren, Zhi [1 ,2 ]
机构：
[1] Westlake Univ, Sch Sci, Dept Phys, 18 Shilongshan Rd, Hangzhou 310024, Zhejiang Provin, Peoples R China
[2] Westlake Inst Adv Study, Inst Nat Sci, 18 Shilongshan Rd, Hangzhou 310024, Zhejiang Provin, Peoples R China
[3] Zhejiang Univ, Sch Phys, Hangzhou 310058, Peoples R China
[4] Fudan Univ, Dept Phys, Shanghai 200433, Peoples R China
来源：
SCRIPTA MATERIALIA | 2023年 / 223卷
基金：
中国国家自然科学基金;
关键词：
High -entropy alloys; Noncentrosymmetric structure; Superconductivity; Magnetic pair breaking; Upper critical field; RH-PD; CORROSION;
D O I：
10.1016/j.scriptamat.2022.115099
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
A series of new Cr5+xMo35xW12Re35Ru13C20 high-entropy alloys (HEAs) have been synthesized and charac-terized by x-ray diffraction, scanning electron microscopy, electrical resistivity, magnetic susceptibility and specific heat measurements. It is found that the HEAs adopt a noncentrosymmetric cubic fl-Mn type structure and exhibit bulk superconductivity for 0 <= x <= 9. With increasing x, the cubic lattice parameter decreases from 6.7940(3) angstrom to 6.7516(3) angstrom. Meanwhile, the superconducting transition temperature Tc is suppressed from 5.49 K to 3.35 K due to the magnetic pair breaking caused by Cr moments. For all these noncentrosymmetric HEAs, the zero-temperature upper critical field Bc2(0) is comparable to the Pauli paramagnetic limit BP(0) = 1.86Tc. In particular, the Bc2(0)/BP(0) ratio reaches a maximum of similar to 1.03 at x = 6, which is among the highest for fl-Mn type superconductors.
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页数：7
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