High-resolution spectrochemical analysis of columnar defects formed in Bi2Sr2CaCu2Ox by swift heavy ion irradiation

F. Kano, M. Terasawa, T. Mitamura, T. Kambara, Y. Sasaki, Y. Ikuhara

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)

Abstract

Single-crystal specimen of high-temperature superconductor Bi 2Sr2CaCu2Ox was irradiated with 3.5 GeV Xe ions at room temperature up to 1.0 × 1011 ion/cm 2. Significant enhancement of magnetization by the irradiation was confirmed. The irradiated specimens were studied by using a high-resolution transmission electron microscope with field emission electron gun (FE-TEM), and, also, with an energy dispersive x-ray analyzer (EDS). Columnar defects with diameter of about 6 nm were observed along the incident ion tracks. By nanoscale high-resolution x-ray spectrochemical analysis across the columnar defect, enrichment of Cu and depletion of Bi, Sr and Ca in the columnar defect center, and vice versa in the outskirts of the defect, was found for the first time. Oxygen depletion in the defect, and increased distribution outside of the defect were also found by electron energy loss spectroscopy. This experimental evidence suggests that the columnar defects are formed as a consequence of Coulomb explosion induced by the electronic excitation of the high-energy heavy ions.

Original languageEnglish
Pages (from-to)459-464
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
Volume792
DOIs
Publication statusPublished - 2003
Externally publishedYes
EventRadiation Effects and Ion-Beam Processing of Materials - Boston, MA., United States
Duration: 2003 Dec 12003 Dec 5

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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