Sarma, DD and Ramasesha, S and Taraphder, A (1989) Hole pairing within an extended Anderson impurity model applicable to the high-Tc cuprates. In: Physical Review B: Condensed Matter, 39 (16). 12286 -12289.
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We calculate the binding energy of a hole pair within the extended Anderson Hamiltonian for the high-Tc cuprates including a Cu impurity and an oxygen-derived band. The results indicate that stable hole pairs can be formed for intra-atomic and interatomic Coulomb repulsion strengths larger than 6 and 3.5 eV, respectively. It is also shown that the total hybridization strength between the Cu 3d and oxygen p band should be less than 2.5 eV. The hole pairing takes place primarily within the oxygen-derived p band. The range of parameter values for which hole pairing occurs is also consistent with the earlier photoemission results from these cuprates.
|Item Type:||Journal Article|
|Additional Information:||Copyright of this article belongs to The American Physical Society.|
|Department/Centre:||Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Division of Physical & Mathematical Sciences > Physics
|Date Deposited:||25 Aug 2010 06:18|
|Last Modified:||19 Sep 2010 06:14|
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