在无限层尼基酸盐中发现节点超导的证据
Shannon P Harvey1,2, Bai Yang Wang1,3, Jennifer Fowlie1,2
1Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA 94025.
概括
无限层酸盐是潜在的非常规超导体. 低温测量显示了La-和Pr-尼基酸盐的节点超导性,而Nd-尼基酸盐显示了复杂的磁性行为,掩盖了节点结构.
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:
- 无限层酸盐是一种新的材料类,具有潜在的非传统超导性.
- 确定超导配对对称性对于理解它们的电子性质至关重要.
- 以前的研究已经探索了各种尼基酸盐化合物,但配对对称性仍然是一个开放的问题.
研究的目的:
- 为了研究无限层尼基酸盐中的超导配对对称性.
- 测量磁性透深度在最佳合的La-, Pr-和Nd-尼基酸盐中.
- 阐明磁力在这些材料超导性质中的作用.
主要方法:
- 低温测量磁透深度. 在低温下测量磁透深度.
- 超流体密度温度依赖性的分析.
- 合成和表征La0.8Sr0.2NiO2,Pr0.8Sr0.2NiO2,Nd0.8Sr0.2,和Nd0.7875Sr0.2125NiO2. 这三种物质的合成和表征包括:
主要成果:
- 拉-和Pr-基酸盐表现出超流体密度的二次温度依赖,表明节点超导.
- 在La-和Pr-基酸盐中存在的障碍会影响超导节点结构.
- -尼基酸盐由于4f磁性而表现出复杂的低温行为,阻碍了对节点结构的直接确定.
结论:
- 在基于La和Pr的无限层尼基酸盐中确定了节点超导性.
- 这些发现表明,这些材料的超导状态中,混乱起着作用.
- -尼基酸盐的磁性使研究它们的超导配对对称性变得复杂.
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