证实亚纳米级粒子的反常超导性-猫眼课题宝

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

项目状态：

已结题

起止时间：

2012-04-01 至 2014-03-31

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

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英文摘要

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.

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