Nanometre-sized inhomogeneity in high-Jc Bi2Sr 2CaCu2O8+δ superconductors

M. Nishiyama, G. Kinoda, Y. Zhao, T. Hasegawa, Y. Itoh, N. Koshizuka, M. Murakami

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Abstract

We have performed atomic-scale high-resolution scanning tunnelling microscopy and spectroscopy measurements on the cleaved surface of single crystal Bi2Sr2CaCuO8+δ superconductors with high critical current density Jc. The samples exhibited rugged structure about 15 nm in period, larger than the modulation of the BiO layer, which corresponded well to the energy gap distribution at 77 K. The presence of inhomogeneity from a nanometre to a micrometre scale, in the energy gap distribution, the structural modulation and the chemical composition fluctuation, may play an important role in improving Jc values in the Bi2Sr2CaCu8+δ crystals.

Original languageEnglish
Pages (from-to)1406-1410
Number of pages5
JournalSuperconductor Science and Technology
Volume17
Issue number12
DOIs
Publication statusPublished - 2004 Dec 1

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ASJC Scopus subject areas

  • Ceramics and Composites
  • Condensed Matter Physics
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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