Evolution of high Tc superconductivity of Bi4Sr3-xLaxCa3Cu4Oy upon iodine intercalation

Jin Ho Choy, Seong Ju Hwang, Dong Hoon Kim, Hyung Ho Park

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Abstract

X-ray photoelectron spectroscopic study has been performed to investigate the chemical bonding nature of the iodine intercalated in the lattice of Bi4Sr3-xLaxCa3Cu4Oy, which is strongly correlated with the evolution of superconductivity. X-ray diffraction analyses indicate the formation of first staged iodine intercalates, I2Bi4Sr3-xLaxCa3Cu4Oy, whose superconducting transition temperatures were changed depending upon La substitution rate(x). X-ray photoelectron spectroscopic results exhibit the coexistence of the negative-charged iodine(Iδ-) and the highly oxidized periodate(I+VII) with a different ratio, depending upon the amount of La substitution. The periodate species seems to increase as the increase of the La substitution rate(x), which has led to a conclusion that the excess oxygen may oxidize the intercalated iodine to a highly oxidized periodate. Remarkable depression of periodate concentration during Ar+-ion sputtering underlines that such a highly oxidized species are surely enriched on the surface and/or the grain boundary. Tc evolution upon iodine intercalation will be discussed in view of charge transfer and enhancement of two dimensionality.

Original languageEnglish
Pages (from-to)1589-1590
Number of pages2
JournalSynthetic Metals
Volume71
Issue number1-3
DOIs
Publication statusPublished - 1995 Apr 1

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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