Abstract
The vibrational Monte Carlo calculation gives a finite bulk-limit value of superconducting (SC) condensation energy in the titled model with next-nearest-site transfer energy t′ in an appropriate parameter region. However, the SDW condensation energy computed similarly was found to overwhelm the former. When we try smaller values of on-site Coulomb energy U, the balance is slightly shifted to the SC state. When the trial wave function is improved by taking account of the nearest-neighbor-site correlation, the SC state is favored against the SDW so much that there appears a good prospect to get a parameter region where the bulk-limit SC condensation energy dominates that of the SDW state.
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