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Updated: Apr 13, 2026

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Published on: October 7, 2013

在高压下确定超导La₄Ni₃O_10-δ的单晶结构

Feiyu Li¹, Yinqiao Hao², Ning Guo³

¹Institute of Crystal Materials, State Key Laboratory of Crystal Materials, Shandong University, Jinan, Shandong, 250100, China.

Advanced materials (Deerfield Beach, Fla.)

|August 22, 2025

概括

高压研究显示三层La4Ni3O10-δ单晶的超导性. 结构转换与超导相相关, 提供了对酸盐物理学的新见解.

科学领域:

凝聚物质物理学
材料科学
超导性

背景情况:

由于高温超导性,Ruddlesden-Popper尼基酸盐具有显著的兴趣.
这些材料在高压下的晶体结构尚不清楚,特别是由于单晶衍射数据有限.

研究的目的:

在三层La4Ni3O10-δ单晶中研究高压超导.
确定在高压下晶体结构的演变及其与超导的相关性.

主要方法:

在环境压力下增加三层La4Ni3O10-δ的单晶.
在高压下 (高达53.8GPa) 的同步X射线单晶衍射.
用于检测超导的电传输测量.

主要成果:

在La4Ni3O10-δ中观察到超导性,在53.8GPa时在30K附近开始,在7K时零电阻.
确定了一系列结构转变:P21/a (5.7 GPa) → Bmab (11.0 GPa) → I4/mmm (16.6 GPa).
四边形I4/mm相与超导的出现有相关性.

结论:

在环境压力下培养的酸单晶可以在高压下表现出超导性.
在高压下发现了中间晶体结构 (Bmab),此前没有报告.
这些发现为酸盐的晶体结构和超导性之间的关系提供了新的见解.

关键词:

拉德尔斯登 - 波珀阶段超导性晶体结构流量方法高压超导性酸盐单晶衍射

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