Charge Distribution in Triple-Layered Copper Oxide Superconductors

M. Muroi, Robert Street

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    7 Citations (Scopus)

    Abstract

    Based on the ionic model, we have calculated the cohesive energy E(c) of the crystal as a function of x and y, where x and y are, respectively, the hole concentrations in the outer and inner CuO2 planes, for the following compounds: Tl2Ba2Ca2Cu3O10+delta (Tl-2223), TlBa2Ca2Cu3O9+delta (Tl-1223), Bi2Sr2Ca2Cu3O10+delta (Bi-2223), and HgBa2Ca2Cu3O8+delta (Hg-1223). It is found that the values of n and y corresponding to the minimum E(c) and the variation of E(c) around the minimum in the x-y plane are significantly different among the compounds. The results indicate (1) that in the Tl and Bi compounds a sufficient number of holes to induce superconductivity are spontaneously generated in the CuO2 planes by self-doping even for the stoichiometric composition, while in Hg-1223 the number of holes produced by self-doping is small and extra oxygen ions are necessary to optimize the superconducting properties, and (2) that it is more difficult to achieve a homogeneous distribution of holes among the three CuO2 planes in Bi-2223 than in the Tl or Hg compounds. The effects of oxygen nonstoichiometry and chemical substitutions are also discussed.
    Original languageEnglish
    Pages (from-to)290-310
    JournalPhysica C
    Volume248(3-4)
    DOIs
    Publication statusPublished - 1995

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