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Indirect-exchange coupling as a basic pairing mechanism of high-temperature superconductivity: Quantitative analysis of TC(x) in electron-doped Nd1+xBa2−xCu3Oy and YBa2Cu3O7−x

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  • Jansen, L.
  • Block, R.

Abstract

A quantitative analysis of critical temperatures TC(x) for the cuprate Nd1+xBa2−xCu3Oy and the cuprate YBa2Cu3O7−x is carried through on the basis of an earlier proposed, first-principle, indirect-exchange mechanism of pairing between conduction electrons (quasiparticles) mediated by closed-shell oxygen anions. We conjecture a two-component (two-phase) description for these systems, one component stable at low doping, the other at higher doping content. It is found that TC(x), including the two-plateau structure, is accurately reproduced for both systems. Doping dependence of the quasiparticle Fermi-vector length appears to determine TC(x) of the Nd-compound to a high degree of accuracy. On the other hand, in YBa2Cu3O7−x the development of TC with oxygen deficiency x depends sensitively also on the density of oxygen anions as Cooper-pair mediators. A detailed analysis of these separate effects is given. In conformity with earlier applications of the same formalism, the present results strongly indicate indirect-exchange pairing as a basic mechanism in high-TC cuprate superconductivity.

Suggested Citation

  • Jansen, L. & Block, R., 1998. "Indirect-exchange coupling as a basic pairing mechanism of high-temperature superconductivity: Quantitative analysis of TC(x) in electron-doped Nd1+xBa2−xCu3Oy and YBa2Cu3O7−x," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 259(1), pages 145-164.
    • Handle: RePEc:eee:phsmap:v:259:y:1998:i:1:p:145-164
    DOI: 10.1016/S0378-4371(98)00290-8
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