Observation of Cu spin fluctuations in high-Tc cuprate superconductor nanoparticles investigated by muon spin relaxation

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

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

The nano-size effects of high-Tc cuprate superconductor La2−xSrxCuO4 with x = 0.20 are investigated using X-ray diffractometry, Transmission electron microscopy, and muon-spin relaxation (µSR). 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 µSR measurements revealed the slowing down of Cu spin fluctuations in La2−xSrxCuO4 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 Tc. It is indicated that reducing the particle size of La2−xSrxCuO4 down to nanometer size causes the appearance of magnetism. The magnetism enhances with decreasing particle size.

Original languageEnglish
Article number3450
JournalNanomaterials
Volume11
Issue number12
DOIs
Publication statusPublished - Dec 2021

Keywords

  • Cu spin fluctuations
  • High-T cuprate superconductor
  • Magnetic correlation
  • Muon-spin relaxation
  • Nano-size effects

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