在Nd1-xEuxNiO2薄膜中稀土替代引发的重新进入的非常规超导性
Dung Vu1, Hangoo Lee2, Daniele Nicoletti2
1Department of Applied Physics, Yale University, New Haven, CT, USA.
Nature communications
|March 5, 2026
概括
在Nd1-xEuxNiO2 (NENO) 薄膜中的欧替代增强了超导间隙和磁相互作用. 这推动了NENO走向强合超导,为高温超导提供了新的途径.
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
- 超导电性 超导电性 超导电性
背景情况:
- 高温超导性通常与强合和大超导间隙有关,这些属性尚未在尼基酸盐中得到证实.
- 对于开发先进的超导技术来说,了解酸材料中超导性背后的机制至关重要.
研究的目的:
- 为了研究欧洲 (Eu) 替代 Nd1-xEuxNiO2 (NENO) 薄膜对其超导性能的影响.
- 探索这些材料中的磁相互作用和超导性之间的关系.
- 为了确定Eu的替代是否可以将尼基酸盐推向强合体制.
主要方法:
- 制造具有不同Eu度 (x = 0.2至0.35) 的NENO薄膜.
- 测量磁电阻以确定上临界磁场 (Hc2) 并观察磁场增强的超导.
- 红外光谱测量超导间隙,并计算间隙与Tc的比.
主要成果:
- 置换显著增加了NENO薄膜中的超导差距,表明向强合的方向迈进.
- 磁电阻测量显示了磁场增强的超导性,归因于磁性欧离子和基于Ni的超导状态之间的相互作用.
- 上临界磁场 (Hc2) 强烈偏离弱合保利极限.
- 观察到较大的差距-Tc比率 (2Δ/kBTc ≈5-6),表明与Sr-doped NdNiO2相比,配对机制更强.
结论:
- 在NENO薄膜的间隔层中替代欧是一种有效的策略,可以增强超导间隙并促进强联超导.
- 观察到的磁场增强的超导性突出显示了这些材料中磁性和超导性之间的相互作用.
- 这些发现为设计无限层酸盐的高温超导性开辟了有希望的途径.
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