在压缩的酸单晶中,散装超导率高达96K
Feiyu Li1, Zhenfang Xing2, Di Peng3,4
1State Key Laboratory of Crystal Materials, Institute of Crystal Materials, Shandong University, Jinan, Shandong, China.
Nature
|December 2, 2025
概括
研究人员在环境压力下合成的双层酸单晶中实现了高达96K的超导性. 这一突破克服了晶体生长的挑战,
科学领域:
- 材料科学
- 凝聚物质物理学
- 固态化学
背景情况:
- 像La3Ni2O7这样的Ruddlesden-Popper双层酸盐在高压下显示出接近80K的超导性.
- 在没有高氧压的情况下合成高质量的尼基酸单晶是一种重大挑战.
- 在酸超导体中达到更高的临界温度 (Tc) 是一个关键的研究目标.
研究的目的:
- 在环境压力下合成的双层酸单晶中报告高达96K的超导性.
- 为了克服酸超导体晶体生长的局限性.
- 建立一个结晶结构和超导特性之间的相关性.
主要方法:
- 合成La2SmNi2O7-δ单晶的流生长方法.
- 能量分散光谱,单晶X射线衍射和扫描传输电子显微镜用于晶体表征.
- 核四极共振和低温高压结构研究以探测超导和晶体结构.
主要成果:
- 高质量的同质La2SmNi2O7-δ单晶体的环境压力合成.
- 在21 GPa时观察到零电阻的散装超导,在60 K (20.6 GPa) 时观察到Meissner效应.
- 确定支持超导的单体结构和四角结构,以及环境内平面格子扭曲与更高的Tc之间的相关性.
结论:
- 证明了高质量的双层单晶的环境压力合成的可行方法.
- 在双层酸盐系统中支持超导的结晶结构.
- 通过受控的晶格扭曲,建立了在酸超导体中达到更高临界温度的途径.
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