Confirmation of anomalous superconductivity in subnano-scale particles

证实亚纳米级粒子的反常超导性

• 批准号: 24654099
• 负责人: HASEGAWA Tetsuya
• 金额: $ 2.33万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Challenging Exploratory Research
• 财政年份: 2012
• 资助国家: 日本
• 起止时间: 2012-04-01 至 2014-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-24654099/
• 关键词: 高温超伝導; ナノ粒子; 局所磁気特性; SQUID顕微鏡; 超伝導; サブナノ粒子; ジョセフソン接合; 量子化磁束; 高温超伝導; ナノ粒子; 局所磁気特性; SQUID顕微鏡; 超伝導; サブナノ粒子; ジョセフソン接合; 量子化磁束

Local magnetic properties of YBaCuO superconducting nanoparticles were investigated by scanning Superconducting QUntum Interference Devise (SQUID) microscopy, SSM. The SSM image obtained at 3 K clearly showed magnetic signals. It is unlikely that quantized flux was formed inside a nanoparticle, because the size of nanoparticles is equivalent to the coherence length of YBaCuO. Indeed, the amount of magnetic flux observed by SSM was different from that of quantized flux. Thus, the observed magnetic signal is thought to originate from magnetic flux trapped inside the assembly of subnano-particles, which are connected with each other through Josephson junctions. The magnetic signal disappeared below bulk Tc.

YBACUO超导纳米颗粒的局部磁性特性通过扫描超导体干涉设计（Squid）显微镜SSM来研究。在3 K处获得的SSM图像清楚地显示出磁信号。量化通量不太可能在纳米颗粒内形成，因为纳米颗粒的大小等效于Ybacuo的相干长度。实际上，SSM观察到的磁通量与量化通量不同。因此，观察到的磁信号被认为是源自捕获的磁通量，这些磁通量被困在亚纳诺粒子的组装中，这些磁通量通过约瑟夫森连接处相互连接。磁信号消失在大量TC下方。