TY - JOUR
T1 - Exchange-driven pairing of delocalized carriers in high-temperature superconductors
AU - Stechel, Ellen
AU - Jennison, D. R.
PY - 1989
Y1 - 1989
N2 - 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.
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.
UR - http://www.scopus.com/inward/record.url?scp=35949012122&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=35949012122&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.40.6919
DO - 10.1103/PhysRevB.40.6919
M3 - Article
AN - SCOPUS:35949012122
VL - 40
SP - 6919
EP - 6930
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 1098-0121
IS - 10
ER -