Self-Consistent Solution of the Bond-Asymmetric Two-Band Model for a Cu-O Based High-T_c Superconductor

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概要

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• To describe high-7'. superconductivity the hole-occupation number-constrainedBCS equation is self-consistently solved for the quasi-2D bond-asymmetric two-bandmodel with weak coupling pairing interaction. The model is characterized by the split-ted two oxygen bands and hole transfer interactions among nearest and next nearestneighbour O-sites. Since the self-consistent mean field induced by the Coulomb repul-sion in the 0-site is dependent on the hole-occupation numbers in the oxygen siteOva) (O(#)), n. (n,), behaviour of the square-root singularities in the state density isdetermined by the total hole-occupation num ber, x= n.-I- n,. The self-consistent solu-lion to the extended BCS equation describes ,v-dependence of physical properties andshows substantial quenching of the isotope effect in association with the superconduct-ing phase realized only in a limited range of x. These results are displayed for sometypical sets of interaction strengths.superconductivity, BCS equation, number-constrained HFB equation, self-con-sistent solution, bond-asymmetric model, two-dimensional lattice, phase transi-lion, electronic properties of condensed matter, isotope effect, theory

• 社団法人日本物理学会の論文
• 1991-08-15

著者

• Tomita K

  Yukawa Institute For Theoretical Physics Kyoto University

• Tanabe Kosai

  Department Of Physics College Of Liberal Arts Saitama University

• KURAMOTO Masako

  Konica Corporation

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