Charge Distribution in Triple-Layered Copper Oxide Superconductors

M. Muroi, Robert Street

    Research output: Contribution to journalArticle

    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

    Fingerprint

    Oxide superconductors
    Copper oxides
    Charge distribution
    copper oxides
    charge distribution
    Doping (additives)
    Oxygen
    Hole concentration
    Superconductivity
    Substitution reactions
    Ions
    Crystals
    oxygen ions
    Chemical analysis
    superconductivity
    substitutes
    oxygen
    crystals
    energy

    Cite this

    Muroi, M. ; Street, Robert. / Charge Distribution in Triple-Layered Copper Oxide Superconductors. In: Physica C. 1995 ; Vol. 248(3-4). pp. 290-310.
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    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.",
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    Charge Distribution in Triple-Layered Copper Oxide Superconductors. / Muroi, M.; Street, Robert.

    In: Physica C, Vol. 248(3-4), 1995, p. 290-310.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - Charge Distribution in Triple-Layered Copper Oxide Superconductors

    AU - Muroi, M.

    AU - Street, Robert

    PY - 1995

    Y1 - 1995

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    AB - 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.

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