Abstract
Abstract In order to study the material dependence of the correlation between stripes and d x 2 -y 2 -wave superconductivity (SC) among cuprate superconductors, we have performed a variational Monte Carlo simulation on a two-dimensional Hubbard model with first-, second- and third-nearest-neighbor hopping terms ( t , t ’ and t ”, respectively) by using the Gutzwiller-Jastrow-type wave function taking account of three-body correlations on a triangle, which is efficient for frustrated systems. The condensation energies of the vertical stripes and the homogeneous SC were computed as a function of t’ / t with a fixed relation t” = – t’ /2. We have found that, at the nearly optimal doping with moderately strong on-site Coulomb interaction, the state of maximum condensation energy switches from the vertical stripes to the homogeneous d SC as | t’ / t| increases.
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