Pairing in CuO2 driven by exchange interactions between carriers and localized Cu spins

Ellen Stechel, D. R. Jennison

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Calculations using a realistic multi-band extended Hubbard hamiltonian, which correctly describes the Heisenberg excitation spectrum and superexchange energy of the insulating phase of CuO2, show that the two largest energies relating to the carrier quasiparticle are the carrier bandwidth (> 5 eV) and an exceptionally large (∼3 eV times a density of states factor as in an RKKY interaction) effective exchange energy between a delocalized carrier hole and a localized Cu hole. The Cu holes are found to remain localized in the superconducting materials. Calculations using a model pairing hamiltonian show that this exchange induces (through partial spin-polarization of the Cu holes) an attraction between carriers. This attraction is strong enough to overcome a realistic Coulomb repulsion, hence leading to net attractive pairing. Triplet p-wave (or possibly singlet d-wave) pairing is implied.

Original languageEnglish
Pages (from-to)765-766
Number of pages2
JournalPhysica C: Superconductivity and its Applications
Volume162-164
Issue numberPART 1
DOIs
Publication statusPublished - 1989

ASJC Scopus subject areas

  • Condensed Matter Physics

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