在压力下,MnB4的超导率高达14.2K
Zhe-Ning Xiang1, Ying-Jie Zhang1, Qing Lu1
1National Laboratory of Solid State Microstructures and Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China.
Advanced materials (Deerfield Beach, Fla.)
|December 3, 2024
概括
研究人员发现了基化合物MnB4的超导性,达到创纪录的14.2K过渡温度. 高压抑制了半导体的行为,增强了这种罕见的磁超导体的超导性.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 材料科学 材料科学 材料科学
- 固态化学 固态化学
背景情况:
- 在3D过渡金属化合物中超导性是罕见的,特别是在基于的材料中.
- 有限的固体测量化合物表现出超导性,突出了材料发现的差距.
研究的目的:
- 报道了一种新的基化合物MnB4.4中超导性的发现.
- 研究高压对MnB4的超导特性和结构性行为的影响.
- 探索将3D过渡金属与光元素相结合的潜力,以实现高温超导.
主要方法:
- 合成和MnB4的表征4.
- 高压实验用于诱导和研究超导.
- 在压力下进行结构分析的同步射线X射线衍射.
- 支持实验发现的理论计算.
主要成果:
- 在MnB4中观察到超导性,其初始过渡温度高达14.2K,是基于Mn的石化超导体中最高的.
- 高压 (≈30 GPa) 抑制了弱半导体的行为,并诱导了超导.
- 超导过渡温度 (Tc) 随着压力而增加,在150 GPa时达到14.2 K.
- 单临晶体结构 (S.G:P21/c) 保持不变,但在压力下观察到格子参数b和c的异常交叉.
结论:
- 在寻找基于的超导体方面,MnB4代表了重大进展.
- 高压是一种可行的调参数,可以增强这种材料的超导性.
- 磁性3d过渡金属和光元素的组合为发现高Tc超导体提供了一个有前途的途径.
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