Bulk 2a×2b×c superstructure in TCNQ-treated (Bi, Pb)-2223 cuprates

C. J. Liu, X. J. Wu, H. Yamauchi

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3 Citations (Scopus)


By reaching (Bi, Pb)-2223 cuprate superconductors with TCNQ (7,7,8,8-tetracyanoquinodimethane) in a sealed and evacuated pyrex ampoule at 300°C for 14 days, we have observed a superstructure of 2a×2b×c in a bulk form according to X-ray diffraction and transmission electron microscope analyses. The origin of the 2a×2b×c superstructure could be attributed to an ordering of oxygen vacancies in the CuO2 layers and also likely in the SrO layers. Electrical conductivity of this TCNQ treated (Bi, Pb)-2223 cuprate shows a metal-like temperature dependence with high resistivity (102 ∼ 103 Ω cm), and a relatively rapid resistivity drop at ca. 11.7 K.

Original languageEnglish
Pages (from-to)367-371
Number of pages5
JournalPhysica C: Superconductivity and its applications
Issue number3-4
Publication statusPublished - 1994 Oct 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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