狭间半导体中的超导率 RbBi11/3Te6
Christos D Malliakas1, Duck Young Chung1, Helmut Claus1
1Materials Science Division, Argonne National Laboratory , Argonne, Illinois 60439, United States.
Journal of the American Chemical Society
|October 18, 2016
概括
研究人员在RbBi11/3Te6中发现了超导性, 化学调整将其临界温度 (Tc) 提高到10%,为新型超导体开发开辟了道路.
科学领域:
- 材料科学
- 凝聚物质物理学
- 固态化学
背景情况:
- 超导是一种量子力学现象,在某种临界温度下,材料的电阻为零.
- 由于它们的异构结构,分层材料具有独特的电子特性.
- 发现新的超导化合物对于推进能量传输和磁悬浮等技术至关重要.
研究的目的:
- 发现并描述新型层状化合物RbBi11/3Te6的超导性.
- 研究化学替代对这种新材料系统的超导性能的影响.
- 建立同类系列并探索其新超导体开发的潜力.
主要方法:
- 聚晶和面向单晶RbBi11/3Te6的合成
- 结构和电子属性的表征,包括频段间隙测量.
- 系统地替代Se和Sb以产生RbBi11/3-ySbySexTe6-x.
- 测量超导过渡温度 (Tc) 和超导体体积分.
主要成果:
- 在RbBi11/3Te6中发现了超导性,在约3.2K时发生了急剧转变.
- 该材料具有大量超导性,单晶体中近100%的超导体积分证实了这一点.
- 化学替代 (Se和Sb) 证明了超导过渡的可调性,增加了Tc高达10%.
- RbBi11/3Te6代表了一个具有无限Bi2Te3类层的新同源系列Rb[Bi2n+11/3Te3n+6]的第一个成员.
结论:
- RbBi11/3Te6是一种属于新同类系列的新型散装超导体.
- 电子结构可以通过合和替代进行化学调节,
- 这一发现为探索和设计具有定制性质的超导材料提供了新的平台.
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