Abstract 2 M WS2 is a newly discovered metastable transition metal dichalcogenide (TMDs) material with the highest instinct superconducting transition temperature (Tc) of 8.8 K among all TMDs superconductors. Here we report the structural regulation of 2 M WS2 by Se-doping and careful investigation on the doping effect on superconducting property. The results show that cell volume expands from 217.66 A3 to 231.74 A3 as the ratio of Se/(S + Se) increasing from 0 to 1. At the same time, Tc decreases from 8.75 K to 2.92 K as the ratio increases from 0 to 0.4 along with the carrier concentration dropping from 1.42 × 1021 cm−3 to 8.06 × 1020 cm−3. The entire phase diagram over a large carrier density range is drawn. These results provide insight into the relationship between the structure and superconducting state in 2 M WS2 and can further guide to modify electronic states of other TMDs materials.

中文翻译：

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在 Se 掺杂 2 M WS2 中抑制超导转变温度

摘要 2 M WS2 是一种新发现的亚稳态过渡金属二硫属化物（TMDs）材料，在所有TMDs 超导体中具有最高的本能超导转变温度（Tc）为8.8 K。在这里，我们报告了 Se 掺杂对 2 M WS2 的结构调节，并仔细研究了掺杂对超导性能的影响。结果表明，随着Se/(S + Se)的比值从0增加到1，细胞体积从217.66 A3扩大到231.74 A3。同时，随着比值从0增加到1，Tc从8.75 K减小到2.92 K 0.4 随着载流子浓度从 1.42 × 1021 cm-3 下降到 8.06 × 1020 cm-3。绘制了大载流子密度范围内的整个相图。