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南京大学:镍基超导研究重要进展

  • 2026-06-26 02:57:37
南京大学:镍基超导研究重要进展

2026高温超导和可控核聚变论坛将于10月在杭州召开,会议将探讨全球和中国高温超导与可控核聚变产业进展,托卡马克、仿星器和场反位形(FRC)聚变技术与示范装置,高温超导带材和线材的稳定生产与一致性控制,高温超导关键材料:基带、缓冲层、超导层、保护层和封装层,高温超导靶材和沉积工艺,高温超导市场前景展望:聚变强磁体、电力、医疗设备、磁悬浮、大科学仪器等

6月12官网消息,南京大学物理学院闻海虎、杨欢教授团队首次对常压下具有超导性的双层镍氧化物La2PrNi2O7薄膜进行了单粒子隧道谱研究,取得重要进展。实验观测到能量为19 meV的主导超导大能隙和约6-8 meV的小能隙。谱线拟合结果显示,该超导大能隙具有低各向异性的s波特征。同时,实验还观测到与超导态密切相关的高能玻色模结构,支持能隙变号行为。上述结果共同指向s±的超导配对图像。相关成果近期以 “Single-particle tunneling spectrum with a robust superconducting gap in La2PrNi2O7 thin films at ambient pressure” 为题发表于Science Advances [Sci. Adv. 12, eaeg2429 (2026)]

1. RP相镍基La2PrNi2O7超导薄膜中测量的隧道谱。(a) 针尖修饰法获得的不同超导层,其中两层薄膜(Layer 12)高度均为1单元厚度(约2nm);(b) 在超导较好的内层薄膜上测量到的隧道谱。(c) b图对应的二阶微分电导曲线,能够清晰的看到两个能隙结构。

研究团队成功制备了常压超导的La2PrNi2O7薄膜,电阻测量其超导起始转变温度为41.5 K由于薄膜表面在空气暴露后发生了污染和退化,无法直接在薄膜表面测量到高质量的隧道谱。为此,研究团队采用独创的针尖修饰技术,局域去除表层退化层,暴露内层超导电性较好的超导薄膜(图1a),并开展隧道谱测量。研究团队在0.4 K温度下获得了清晰隧道谱(图1b),谱线在±19 mV偏压附近呈现出清晰的超导相干峰,同时在±6–8 mV附近存在拐点,该小能量尺度在电导二阶微分曲线中能更明显地发现(图1c)。这表示通过针尖修饰技术能够观测到质量较好的超导隧道谱,谱线表明该体系中可能存在双能隙结构。同时,在超导能隙外±49 mV发现宽峰结构。

2. La2PrNi2O7薄膜超导隧道谱随温度的变化以及超导能隙分析。

通过变温实验(图2a),可以发现隧道谱上大能隙对应的相干峰特征随着温度升高逐渐减弱,在超导临界温度附近彻底消失。同时,高能的宽峰结构也随着温度的升高减弱并逐渐消失,证明宽峰和超导的密切关系。通过对最低温度0.4 K下测量的隧道谱进行双能隙的Dynes模型拟合发现,大能隙是d波时无法拟合测量曲线(图2d),而只有大能隙是各向异性的s波时才能较好地拟合实验数据(图2b,c),且各向异性度只有百分之20左右。但是拟合无法确定小能隙是否有能隙节点,基于对称性考虑一般不会同时存在s波和d波的超导电性,因此本实验结果支持双层镍基超导薄膜的超导配对对称性是s±配对

结合理论,进一步确定该双层镍基高温超导主要由层间相互作用驱动配对,再结合面内的。和超导密切相关的高能宽峰,可能是超导玻色模。类比团队前期在铁基高温超导中玻色模能量的确定方法【Nat. Phys. 9, 42 (2013)】,得到玻色模能量约为30 meV,该能量尺度与大能隙的比值也符合集体激发模的特征。非常规超导体中的玻色模可能是超导能隙符号变号的直接结果,因此玻色模的发现也支持了材料中能隙反转的s±配对形式。这是对镍基超导薄膜的超导能隙的首次隧道谱探测,这一结果对于双层镍基超导电性有重要的启示作用。

南京大学物理学院范圣泰博士和欧梦军博士为论文共同第一作者,南京大学物理学院闻海虎教授、杨欢教授和德国鲁尔大学Ilya M. Eremin教授为共同通讯作者。该工作得到国家重点研发计划、国家自然科学基金、江苏省自然科学基金、固体微结构物理全国重点实验室、2011计划人工微结构科学与技术协同创新中心” 的支持。

信息来源:南京大学超导物理和材料研究中心
2026高温超导和可控核聚变论坛坛将于10月在杭州召开,我们诚挚邀请行业专家作以下主题的演讲报告

1. 全球和中国高温超导与可控核聚变产业进展

2. 高温超导市场展望:核聚变、电力、医疗设备、磁悬浮、大科学仪器

3. 高温超导技术路线比较:铜基超导、铋基超导和铁基超导

4. 高温超导带材和线材的稳定生产与一致性控制

5. 高温超导失超保护机理研究与系统设计

6. 高温超导关键材料:基带、缓冲层、超导层、保护层和封装层

7. 高温超导沉积工艺:脉冲激光沉积、化学气相沉积和金属有机溶液沉积等

8. 超导层靶材:GdBCO、YBCO、SmBCO以及掺杂靶材

9. 缓冲层靶材:氧化铈、氧化钇、氧化锆、镧锰氧化物、氧化镁等

10. 高温超导强磁体技术与商业化生产

11. 托卡马克和球形托卡马克聚变技术与示范项目

12. 仿星器路线聚变难点分析与解决思路

13. 场反位形(FRC)聚变:磁约束稳态FRC和磁惯性约束脉冲式FRC

14. 资本市场助力高温超导和聚变产业加速发展

15. 高温超导应用于AI数据中心的可行性

16. 高温超导在核磁共振(MRI)的发展前景

17. 高温超导在磁悬浮和商业航天电磁发射的应用

18. 高温超导用于输电电缆和故障限流器的优势分析

19. 高温超导储能技术研发进展与应用场景展望

20. 高温超导织构块体生产工艺与工程应用

为促进高温超导领域的技术转化与产业协同,亚化搭建了“高温超导产业交流微信群”,拟聚集上游超导带材原料、中游超导线材/磁体研发与关键设备制造、以及下游数据中心、磁悬浮交通及可控核聚变磁体应用等全产业链资源,欢迎大家扫码添加小编微信拉群。

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  1. CONNECT:[ UseTime:0.001193s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001824s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000791s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000718s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001333s ]
  6. SELECT * FROM `set` [ RunTime:0.000591s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001420s ]
  8. SELECT * FROM `article` WHERE `id` = 587315 LIMIT 1 [ RunTime:0.004098s ]
  9. UPDATE `article` SET `lasttime` = 1782583597 WHERE `id` = 587315 [ RunTime:0.037083s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.003727s ]
  11. SELECT * FROM `article` WHERE `id` < 587315 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.012880s ]
  12. SELECT * FROM `article` WHERE `id` > 587315 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001092s ]
  13. SELECT * FROM `article` WHERE `id` < 587315 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004423s ]
  14. SELECT * FROM `article` WHERE `id` < 587315 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001898s ]
  15. SELECT * FROM `article` WHERE `id` < 587315 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001857s ]
0.186282s