Local Pairing and Antiferromagnetism in High-Tc Superconductors
The CuO2 planes in high-temperature superconductors are studied by a two-dimensional Hubbard Hamiltonian with a new proposed vacuum (d9p6). The superexchange energy between Cu sites and the hopping parameters of the carriers estimated in this new vacuum are in good agreement with experimental observations as well as numerical calculations with a finite cluster. Single carriers (electrons for n-type or holes for p-type) are localized due to the rigidity of the antiferromagnetic background. Local pairing in the CuO2 plane enables the paired states to move around without disturbing the antiferromagnetic background. The binding energy is estimated from the pair hopping energy, which causes the paired state to be lower in energy than the single carrier state.
KeywordsCoulomb Repulsion Paired State Local Pairing Single Carrier Antibonding State
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