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在Bi3O2S2Cl中具有Bi-Cl平面层的超导性
Bin-Bin Ruan1,2, Kang Zhao1,2, Qing-Ge Mu1,2
1Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences , Beijing 100190 , People's Republic of China.
Journal of the American Chemical Society
|February 12, 2019
概括
研究人员发现了一种新的石化合物Bi3O2S2Cl, 这种材料通过调整硫含量,从半导体转变为超导体 (2.6-3.5K),为新材料开辟了道路.
科学领域:
- 固态化学
- 材料科学
- 凝聚物质物理
背景情况:
- 层状化物因其独特的结构和电子性质而有趣.
- 探索新的分层结构可以带来新的功能材料.
研究的目的:
- 合成和表征一种具有新层结构的四级石化合物.
- 调查新发现的化合物的电子特性,特别是超导性.
- 探索构成和物理性质之间的关系,例如从半导体到超导体的过渡.
主要方法:
- 单晶和多晶样品的合成.
- 结构分析的X射线衍射 (空间组I4/mmm,格子参数a = 3.927(1) Å,c = 21.720(5) Å).
- 超导度测量 (临界温度的确定).
主要成果:
- 合成了一种具有独特[BiS2Cl]2-层的新型四级化合物Bi3O2S2Cl.
- 该化合物具有层状结构,和形成无限平面层.
- 在多晶体和单晶体中观察到超导性,临界温度在2. 6到3. 5K之间.
- 通过降低硫含量或增加合成温度来增强超导性.
- 通过调整硫含量实现了半导体到超导体的转换.
结论:
- [BiS2Cl]2层的发现为探索基于石的化合物提供了新的平台.
- Bi3O2S2Cl具有可调节的电子特性,从半导体转变为超导体.
- 这项工作扩大了层状化物及其在超导中的潜在应用.
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