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

Fingerprint

Hamiltonians
Exchange interactions
Spin polarization
Superconducting materials
attraction
interactions
Bandwidth
energy transfer
bandwidth
energy
polarization
excitation

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Pairing in CuO2 driven by exchange interactions between carriers and localized Cu spins. / Stechel, Ellen; Jennison, D. R.

In: Physica C: Superconductivity and its Applications, Vol. 162-164, No. PART 1, 1989, p. 765-766.

Research output: Contribution to journalArticle

@article{b23efc6b055641028dc4734396d7802d,
title = "Pairing in CuO2 driven by exchange interactions between carriers and localized Cu spins",
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.",
author = "Ellen Stechel and Jennison, {D. R.}",
year = "1989",
doi = "10.1016/0921-4534(89)91249-5",
language = "English",
volume = "162-164",
pages = "765--766",
journal = "Physica C: Superconductivity and its Applications",
issn = "0921-4534",
publisher = "Elsevier",
number = "PART 1",

}

TY - JOUR

T1 - Pairing in CuO2 driven by exchange interactions between carriers and localized Cu spins

AU - Stechel, Ellen

AU - Jennison, D. R.

PY - 1989

Y1 - 1989

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=0024943976&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0024943976&partnerID=8YFLogxK

U2 - 10.1016/0921-4534(89)91249-5

DO - 10.1016/0921-4534(89)91249-5

M3 - Article

VL - 162-164

SP - 765

EP - 766

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

SN - 0921-4534

IS - PART 1

ER -