title: Enhancement of pairing correlation by t' in the two-dimensional extended t-J model.
abstract: We investigate the effects of the next-nearest-neighbor (t') and the third-nearest-neighbor (t") hopping terms on superconductivity correlation in the 2D hole-doped extended t-J model based on the variational Monte Carlo, mean-field calculation and exact diagonalization method. Despite the diversity of the methods employed, the results all point to a consistent conclusion: While the d-wave superconductivity correlation is slightly suppressed by t' and t" in underdoped regions, it is greatly enhanced in the optimal and overdoped regions. The optimal Tc is a result of the balance of these two opposite trends.
authors.affiliation: Department of Physics, Tunghai University, Taichung, Taiwan.
authors.forename: C T
authors.initials: CT
authors.lastname: Shih
authors.forename: T K
authors.initials: TK
authors.lastname: Lee
authors.forename: R
authors.initials: R
authors.lastname: Eder
authors.forename: C-Y
authors.initials: CY
authors.lastname: Mou
authors.forename: Y C
authors.initials: YC
authors.lastname: Chen