当前位置:首页>南京>南京大学物理学院闻海虎、杨欢Science子刊!!常压镍基超导能隙关键实验证据出炉

南京大学物理学院闻海虎、杨欢Science子刊!!常压镍基超导能隙关键实验证据出炉

  • 2026-06-27 12:45:27
南京大学物理学院闻海虎、杨欢Science子刊!!常压镍基超导能隙关键实验证据出炉

材料研究前沿——聚焦材料科学研究前沿进展。100多万材料领域硕博教师们订阅的微信大号。点击标题下蓝字“材料研究前沿”关注,我们将为您提供有价值、最前沿的材料研究资讯。

镍基氧化物超导体是近年非常规高温超导领域核心研究体系,为破解高温超导微观配对机制提供全新研究路径。科研人员最早在无限层 Nd₁₋ₓSrₓNiO₂薄膜中观测到超导现象,后续在 Ruddlesden-Popper 型双层镍酸盐 La₃Ni₂O₇高压样品中实现最高 80K 超导转变温度,极大推动该领域发展。随着应变调控工艺迭代,学界实现 La₃Ni₂O₇衍生薄膜常压 40K 区间超导,摆脱高压设备限制,让常压下直接观测超导本征物性成为现实。但该类双层镍酸盐电子配对对称性长期存在理论分歧,主流假说分为 s± 波与 d 波配对两类,超导能隙对称特征是区分两种模型的核心判据。此前相关实验仅能依托高压样品开展,难以获取高质量隧穿谱数据,无法为理论争论提供可靠实验支撑。常压超导薄膜的出现填补了这一实验空白,借助扫描隧道显微谱学手段直接解析超导能隙结构,能够客观判别电子配对形式,完善双层镍酸盐高温超导机理的完整理论框架,对后续新型高温超导材料设计具备重要参考价值。

在这项研究中,研究人员联合海外理论学者制备出高质量 La₂PrNi₂O₇双层镍氧化物超导薄膜,样品超导起始转变温度达到 41.5K,依托针尖挖掘技术剥离薄膜表层,直接暴露内部超导功能层,并在 0.4K 极低温环境下完成单粒子隧穿谱定量检测。实验采集到稳定、可重复的超导能隙信号,测得主导能隙数值约 19meV,该能隙整体各向异性程度偏低。团队采用 Dynes 标准模型对谱学数据拟合分析,拟合结果证明该主导能隙符合 s 波对称特征,直接排除 d 波作为主导配对形式的可能性,有力佐证 s± 配对机制。实验同时捕捉到 6–8meV 区间次级小能隙,同样呈现弱各向异性 s 波属性;在 49±2meV 能量区间观测到显著鼓包特征结构。研究人员计算该结构能量与主能隙、超导临界温度的比值,数值与非常规超导体自旋共振玻色子模特征高度吻合,判定该鼓包为介导电子配对的玻色激发模式。整套实验完整获取常压双层镍酸盐薄膜的能隙多尺度谱学信息,为厘清镍基超导电子配对过程提供直接、完整的微观实验数据。

本次基于常压 La₂PrNi₂O₇薄膜的单粒子隧穿谱研究,从实验层面明确双层镍酸盐超导体的核心配对规律,为持续多年的理论争议给出关键判定依据。双能隙拟合结果区分出成键能带对应的 19meV 大能隙与反键能带对应的 6–8meV 小能隙,进一步拆分计算得到层间配对能约 13meV、层内配对能约 6meV,证实层间电子相互作用是驱动超导配对的核心因素。49meV 处玻色子模信号与超导态同步消失,证明该玻色激发和电子配对行为强耦合,补充完善 s± 配对模型的微观物理图像。尽管现有谱学数据充分支撑 s 波主导的 s± 配对理论,彻底否定 d 波主导配对的猜想,但仍缺少动量分辨维度的实验数据交叉验证,无法完全覆盖费米面全区域能隙特征。该工作搭建起常压镍基超导薄膜谱学标准化测试方案,降低后续同类体系机理研究的实验门槛,明确后续研究需围绕角分辨光电子能谱等动量分辨表征开展,进一步验证 s± 配对理论普适性。整体成果补齐双层镍基高温超导机理的关键实验短板,为定向研发更高转变温度镍基超导材料提供清晰的物理机制指引。

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  1. CONNECT:[ UseTime:0.000966s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001489s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.010038s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.007070s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001347s ]
  6. SELECT * FROM `set` [ RunTime:0.019749s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001286s ]
  8. SELECT * FROM `article` WHERE `id` = 593801 LIMIT 1 [ RunTime:0.074034s ]
  9. UPDATE `article` SET `lasttime` = 1782544035 WHERE `id` = 593801 [ RunTime:0.070187s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.009334s ]
  11. SELECT * FROM `article` WHERE `id` < 593801 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.025009s ]
  12. SELECT * FROM `article` WHERE `id` > 593801 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.025754s ]
  13. SELECT * FROM `article` WHERE `id` < 593801 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.071754s ]
  14. SELECT * FROM `article` WHERE `id` < 593801 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.127099s ]
  15. SELECT * FROM `article` WHERE `id` < 593801 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.163768s ]
0.743637s