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在二化物BiH_{2}中进行高压超导转换,采用石开放通道框架

Liang Ma^1,2,3, Xin Yang⁴, Mei Li⁴

¹Institute of Physics, Chinese Academy of Sciences, Beijing National Laboratory for Condensed Matter Physics and , Beijing 100190, China.

Physical review letters

|December 12, 2025

概括

研究人员合成了一种新的二超导体Cmcm-BiH2,在62 K达到超导. 这一发现挑战了对金属化物的先前预期,并突出了非元素在高温超导中的作用.

科学领域:

材料科学材料科学材料科学
凝聚物质物理学凝聚物质物理学
超导电性超导电性超导电性

背景情况:

具有低含量的金属化物 (MHx,x≤2) 一般不预计会表现出高温超导性 (高-T<0xE1><0xB5><0x84>).
这是由于对电子状态密度和电子-声波合强度的贡献有限.

研究的目的:

报告一种新型二化物Cmcm-BiH2.2的合成和超导性.
研究这种新材料的结构和电子特性,这些特性有助于这种新材料的超导性.

主要方法:

在大约150 GPa 的高压合成Cmcm-BiH2.
通过阻力下降和163 GPa的磁场响应来测量超导.
使用理论计算分析结构稳定性和电子性能.

主要成果:

成功合成Cmcm-BiH2,这是MH2型金属二化物中一种新型超导体.
在163 GPa时发现超导率,T<0xE1><0xB5><0x84> ≈62 K,其明显的电阻下降和临界场依赖性证明了这一点.
Cmcm-BiH2 呈现出一种独特的宿主-客 structure 结构,具有金属木道,对电子-声子合 (λ) 贡献很大 (≈51%).
该材料在解压时显示稳定性低至97 GPa,计算的动态稳定性极限为10 GPa.

结论:

Cmcm-BiH2代表了MH2型金属二化物中的第一个超导体,挑战了以前的理论限制.
该研究强调了非元素,特别是木框架在实现高T<0xE1><0xB5><0x84>超导性方面的关键作用.
这些发现开辟了设计和优化高温化物超导体的新途径,重点关注结构多样性和宿主元素的贡献.

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