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<p>As a typical superconducting material, PbMo<sub>6</sub>S<sub>8</sub> (PMS) exhibits many advantages, such as high critical field, low fabrication cost, etc. Therefore, it has attracted the attention of researchers. With in its lattice, sulfide plays a pivotal role in the phase composition, microstructure, as well as superconducting properties. In this study, PbMo<sub>6</sub>S<sub><i>x</i></sub> bulks with different S content have been successfully synthesized using the solid-state sintering method. It reveals that single phase PMS can be achieved within the S content of 7.8–8.0. And Pb, Mo and MoS<sub>2</sub>, Pb appear respectively, when the S content was deficient or excessive. Furthermore, variations in S content influence the superconducting transition temperature (<i>T</i><sub>c</sub>) and the flux pinning force density (<i>F</i><sub>p</sub>) of PbMo<sub>6</sub>S<sub><i>x</i></sub> samples, which consequently results in alterations to the critical current density (<i>J</i><sub>c</sub>). With the S content of 7.8, the maximum <i>T</i><sub>c</sub> value of 12.5&#xa0;K and the highest critical current density (<i>J</i><sub>c</sub>) of over 30&#xa0;kA/cm<sup>2</sup> were obtained. This work proves that with the optimization of fabrication process, PMS with high superconducting properties can be achieved as promising practical superconductors.</p>

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Effects of sulfur content on the superconducting properties of PbMo6Sx superconductors

  • 期刊论文

  • 发表日期：

    2025年12月18日

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  • Botao Shao,
  • Lingfeng Ling,
  • Guobiao Kang,
  • Jixing Liu,
  • Shengnan Zhang,
  • Jianfeng Li,
  • Pingxiang Zhang

摘要

As a typical superconducting material, PbMo6S8 (PMS) exhibits many advantages, such as high critical field, low fabrication cost, etc. Therefore, it has attracted the attention of researchers. With in its lattice, sulfide plays a pivotal role in the phase composition, microstructure, as well as superconducting properties. In this study, PbMo6Sx bulks with different S content have been successfully synthesized using the solid-state sintering method. It reveals that single phase PMS can be achieved within the S content of 7.8–8.0. And Pb, Mo and MoS2, Pb appear respectively, when the S content was deficient or excessive. Furthermore, variations in S content influence the superconducting transition temperature (Tc) and the flux pinning force density (Fp) of PbMo6Sx samples, which consequently results in alterations to the critical current density (Jc). With the S content of 7.8, the maximum Tc value of 12.5 K and the highest critical current density (Jc) of over 30 kA/cm2 were obtained. This work proves that with the optimization of fabrication process, PMS with high superconducting properties can be achieved as promising practical superconductors.