Enhancement of Pairing Correlation by t' in the Two-Dimensional Extende d t-J Model

Abstract

We investigate the effects of the next-nearest-neighbor ($t^{\prime }$) and the third-nearest-neighbor (t") hopping terms on superconductivity (SC) correlation in the 2D hole-doped extended t-J model based on the variational Monte-Carlo (VMC), mean-field (MF) calculation, and exact diagonalization (ED) method. Despite of the diversity of the methods employed, the results all point to a consistent conclusion: While the d-wave SC correlation is slightly suppressed by t' and t" in underdoped regions, it is greatly enhanced in the optimal and overdoped regions. The optimal T_c is a result upon balance of these two opposite trends.

5 figures, submitted to Phys. Rev. Lett

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• Angle-resolved photoemission spectroscopy of the cuprate superconductors
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• Superconductivity in the two-dimensional t-J model
• Theory for Slightly Doped Antiferromagnetic Mott Insulators
• Qualitative understanding of the sign of t' asymmetry in the extended t-J Model and relevance for pairing properties
• Variation of Superconducting Transition Temperature in Hole-Doped Copper-Oxides

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