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Bulk superconductivity and Pauli paramagnetism in nearly stoichiometricCuCo2S4
Physical Review Materials ( IF 3.1 ) Pub Date : 2021-07-29 , DOI: 10.1103/physrevmaterials.5.074804
Yu-Ying Jin 1 , Shi-Huai Sun 1 , Yan-Wei Cui 1, 2 , Qin-Qing Zhu 1, 2 , Liang-Wen Ji 1 , Zhi Ren 2 , Guang-Han Cao 1, 3
Affiliation  

It has long remained elusive whether CuCo2S4 thiospinel shows bulk superconductivity (SC). Here we clarify the issue by studying the samples of sulfur-deficient CuCo2S3.7 and sulfurized CuCo2S4. The sample CuCo2S3.7 has a smaller lattice constant of a=9.454 Å, and it is not superconducting down to 1.8 K. After a full sulfurization, the a axis of the thiospinel phase increases to 9.475 Å, and the thiospinel becomes nearly stoichiometric CuCo2S4, although a secondary phase of slightly Cu-doped CoS2 forms. Bulk SC at 4.2 K and Pauli paramagnetism have been demonstrated for the sulfurized CuCo2S4 by the measurements of electrical resistivity, magnetic susceptibility, and specific heat.

中文翻译:

接近化学计量的 CuCo2S4 中的体超导性和泡利顺磁性

长期以来一直难以捉摸 铜钴24硫尖晶石显示体超导性 (SC)。这里我们通过研究缺硫样品来澄清问题。铜钴23.7 和硫化 铜钴24. 样品铜钴23.7 具有较小的晶格常数 一种=9.454 Å,并且它不会超导至 1.8 K。在完全硫化后, 一种 硫尖晶石相的轴增加到 9.475 Å,硫尖晶石变得接近化学计量 铜钴24,虽然轻微掺杂铜的第二相 服务中心2形式。4.2 K 的体 SC 和泡利顺磁性已被证明用于硫化铜钴24 通过测量电阻率、磁化率和比热。
更新日期:2021-07-29
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