Effect of nano-scale additions on the enhancement of superconductivity in Y-Ba-Cu-O materials

Shih Yun Chen, In Gann Chen, Ping Chi Hsieh, Maw Kuen Wu

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The coherence length of Y-Ba-Cu-O superconductor is in the nano-meter range, therefore, nano-scale additions can be used to increase the number of effective pinning centers in top-seed melt-growth (TSMG) Y-Ba-Cu-O single grain materials. Different kinds of nano-scale additions: Y2O3, and Y2BaCuO5 (Y211) were mixed with precursor powders (YBa2Cu3O7 + Y2BaCuO) followed by TSMG process in air. SEM and TEM were used to investigate the size and morphology of the 211-particles as well as the distribution of defects (e.g. dislocations) in the matrix. It was found that the size of 211-particles was slightly reduced in nm Y2O3 doped samples, and sub-micro 211-particles were observed in nmY211 doped samples. In addition, the critical temperature, T c, for all samples was similar and independent of the type of addition, while the enhancement of critical current density, J c(H, T), varied with the types of nano-scale addition. Accordingly, the reactions between the superconductive matrix and different nano-scale additions resulted in different pinning properties. These samples with different nano-scale additions were studied using scaling rule analysis to differentiate their pinning mechanisms. For comparison, the results of SmBCO samples with nano-scale additions are also discussed in this study.

Original languageEnglish
Pages (from-to)857-863
Number of pages7
JournalJournal of Electroceramics
Volume13
Issue number1-3
DOIs
Publication statusPublished - 2004 Jul 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Mechanics of Materials
  • Electrical and Electronic Engineering
  • Materials Chemistry

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