Enhancement of the critical current density in single-crystal Bi2Sr2CaCu2O8 superconductors by chemically induced disorder

Yue Li Wang, Xian Liang Wu, Chia Chun Chen, Charles M. Lieber

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

The effect of metal substitution on the critical current densities of single-crystal PbxBi2-xSr2CaCu2O8 (x = 0 or x = 0.7) superconductors has been investigated. Substitution of lead was found to increase the average critical current density from 1 × 105 A/cm2 to 2 × 106 A/cm2 at 5 K in an applied magnetic field of 10 kilooersteds (1 oersted = 80 A/m). The order of magnitude increase in the critical current density was observed for temperatures up to the flux vortex lattice melting point; the flux lattice melting point was also found to increase to 30 K (from 22 K) in the lead-substituted materials. Diffraction and microscopy investigations of the structural parameters indicate that the fundamental atomic lattices are virtually the same for both materials. Scanning tunneling microscopy images demonstrate, however, that lead substitution causes significant disorder (or defects) in the one-dimensional superstructure found in Bi2Sr2CaCu2O8. Since crystal defects can increase the critical current density by pinning the motion of flux vortices, it is likely that this lead-induced disorder enhances vortex pinning. The leadinduced disorder is specific to the nonsuperconducting Bi-O layers, and thus our results suggest that chemical substitutions may be utilized to control selectively flux pinning and the critical current density in these materials.

Original languageEnglish
Pages (from-to)7058-7060
Number of pages3
JournalProceedings of the National Academy of Sciences of the United States of America
Volume87
Issue number18
DOIs
Publication statusPublished - 1990 Sep

Keywords

  • Defects
  • Metal substitution
  • Scanning tunneling microscopy
  • Superstructure

ASJC Scopus subject areas

  • General

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