利用μ子自旋弛豫研究高铜酸盐超导纳米颗粒中铜自旋涨落的观察

Observation of Cu Spin Fluctuations in High- Cuprate Superconductor Nanoparticles Investigated by Muon Spin Relaxation.

作者信息

Winarsih Suci, Budiman Faisal, Tanaka Hirofumi, Adachi Tadashi, Koda Akihiro, Horibe Yoichi, Kurniawan Budhy, Watanabe Isao, Risdiana Risdiana

机构信息

Department of Physics, Padjadjaran University, Sumedang 45363, Indonesia.

Department of Human Intelligence Systems, Kyushu Institute of Technology, Kitakyushu 808-0196, Japan.

出版信息

Nanomaterials (Basel). 2021 Dec 20;11(12):3450. doi: 10.3390/nano11123450.

DOI:10.3390/nano11123450

PMID:34947799

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8706420/

Abstract

The nano-size effects of high- cuprate superconductor LaSrCuO with = 0.20 are investigated using X-ray diffractometry, Transmission electron microscopy, and muon-spin relaxation (SR). It is investigated whether an increase in the bond distance of Cu and O atoms in the conducting layer compared to those of the bulk state might affect its physical and magnetic properties. The SR measurements revealed the slowing down of Cu spin fluctuations in LaSrCuO nanoparticles, indicating the development of a magnetic correlation at low temperatures. The magnetic correlation strengthens as the particle size reduces. This significantly differs from those observed in the bulk form, which show a superconducting state below . It is indicated that reducing the particle size of LaSrCuO down to nanometer size causes the appearance of magnetism. The magnetism enhances with decreasing particle size.

摘要

利用X射线衍射、透射电子显微镜和μ子自旋弛豫（SR）研究了具有x = 0.20的高铜酸盐超导体LaSrCuO的纳米尺寸效应。研究了与块状状态相比，导电层中Cu和O原子的键距增加是否会影响其物理和磁性能。SR测量揭示了LaSrCuO纳米颗粒中Cu自旋涨落的减慢，表明在低温下出现了磁相关性。随着粒径减小，磁相关性增强。这与在块状形式中观察到的情况显著不同，块状形式在低于Tc时呈现超导状态。结果表明，将LaSrCuO的粒径减小到纳米尺寸会导致磁性的出现。磁性随着粒径的减小而增强。