Exchange-driven pairing of delocalized carriers in high-temperature superconductors

E. B. Stechel; D. R. Jennison

doi:10.1103/PhysRevB.40.6919

Exchange-driven pairing of delocalized carriers in high-temperature superconductors

E. B. Stechel, D. R. Jennison

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

A semiquantitative pairing model is derived from the properties of a realistic Hamiltonian for CuO2 sheets. Due to large interactions between oxygen ions, to first-order delocalized carriers pair via localized spin-system holes on the Cu sublattice. The largest carrier-Cu couplings are dynamic exchange processes involving the Cu(d10) and Cu(d8) configurations. Up to carrier concentrations of 3040 %, exchange-mediated attraction overcomes the large carrier Coulomb repulsion, present because of dielectric local screening. The same mechanism is shown to be capable of explaining high-temperature superconductivity in BiO3. The pairing interaction is attractive for triplet and repulsive for singlet s-wave pairs.

Original language	English (US)
Pages (from-to)	6919-6930
Number of pages	12
Journal	Physical Review B
Volume	40
Issue number	10
DOIs	https://doi.org/10.1103/PhysRevB.40.6919
State	Published - 1989
Externally published	Yes

ASJC Scopus subject areas

Condensed Matter Physics

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10.1103/PhysRevB.40.6919

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title = "Exchange-driven pairing of delocalized carriers in high-temperature superconductors",

abstract = "A semiquantitative pairing model is derived from the properties of a realistic Hamiltonian for CuO2 sheets. Due to large interactions between oxygen ions, to first-order delocalized carriers pair via localized spin-system holes on the Cu sublattice. The largest carrier-Cu couplings are dynamic exchange processes involving the Cu(d10) and Cu(d8) configurations. Up to carrier concentrations of 3040 %, exchange-mediated attraction overcomes the large carrier Coulomb repulsion, present because of dielectric local screening. The same mechanism is shown to be capable of explaining high-temperature superconductivity in BiO3. The pairing interaction is attractive for triplet and repulsive for singlet s-wave pairs.",

author = "Stechel, {E. B.} and Jennison, {D. R.}",

year = "1989",

doi = "10.1103/PhysRevB.40.6919",

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AU - Jennison, D. R.

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AB - A semiquantitative pairing model is derived from the properties of a realistic Hamiltonian for CuO2 sheets. Due to large interactions between oxygen ions, to first-order delocalized carriers pair via localized spin-system holes on the Cu sublattice. The largest carrier-Cu couplings are dynamic exchange processes involving the Cu(d10) and Cu(d8) configurations. Up to carrier concentrations of 3040 %, exchange-mediated attraction overcomes the large carrier Coulomb repulsion, present because of dielectric local screening. The same mechanism is shown to be capable of explaining high-temperature superconductivity in BiO3. The pairing interaction is attractive for triplet and repulsive for singlet s-wave pairs.

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Exchange-driven pairing of delocalized carriers in high-temperature superconductors

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