Enhancement of Pairing Correlation byt′in the Two-Dimensional Extendedt−JModel

2004/01/30 by C. T. Shih, T. K. Lee, Ting-Kuo Lee +4 · 103 citations
Physics and Astronomy · #Advanced Condensed Matter Physics #Condensed matter physics #Pairing #Physics #Physics of Superconductivity and Magnetism #Superconductivity #Superconductivity in MgB2 and Alloys #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevlett.92.227002

published in Physical Review Letters 92(22), 227002 (American Physical Society) · 5 figures, submitted to Phys. Rev. Lett

arxiv created 2004/01/30 · openalex publication_date 2004/06/04 · arxiv updated 2010/11/16 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We investigate the effects of the next-nearest-neighbor (t^\ensuremath') and the third-nearest-neighbor (t^\ensuremath'\ensuremath') hopping terms on superconductivity correlation in the 2D hole-doped extended t\ensuremath-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^\ensuremath' and t^\ensuremath'\ensuremath' in underdoped regions, it is greatly enhanced in the optimal and overdoped regions. The optimal T_c is a result of the balance of these two opposite trends.

Citations

• Angle-resolved photoemission studies of the cuprate superconductors

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