Pairing fluctuations in a one-dimensional copper oxide model

E. B. Stechel, A. Sudbo, T. Giamarchi, C. M. Varma

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Abstract

The exact ground-state energy E0 is calculated for a one-dimensional copper-oxide model defined on a ring of finite length L, threaded by an external flux . It includes on-site and nearest-neighbor intersite Coulomb repulsion V, as well as a nonzero bare oxide gap 0 between the orbitals in the unit cell. The correlation exponent K of the corresponding low-energy Hamiltonian shows that singlet (extended s-wave) superconductivity has the most rapidly diverging susceptibility as T0 (K>1). This superconducting phase is located close to a phase-separation instability of the model, indicated by K. Longer range of the Coulomb interaction tends to frustrate phase separation, enhances the range of V for which K>1, and slightly broadens the regime of V where 1<K<.

Original languageEnglish
Pages (from-to)553-560
Number of pages8
JournalPhysical Review B
Volume51
Issue number1
DOIs
Publication statusPublished - Jan 1 1995

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ASJC Scopus subject areas

  • Condensed Matter Physics

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