Development of superconducting correlation at low temperatures in the two-dimensional t-J model

Abstract

The equal-time pairing correlation function of the two-dimensional t-J model on a square lattice is studied using a high-temperature expansion method. The sum of the pairing correlation, its spatial dependence, and the correlation length are obtained as functions of temperature down to $T\simeq 0.2t$. By comparison of single-particle contributions in the correlation functions, we find an effective attractive interaction between quasi-particles in $d_{x^2-y^2}$-wave pairings. It is shown that d-wave correlation grows rapidly at low temperatures for 0.5 < n < 0.9, with n being the electron density. The temperature for this growth is roughly scaled by J/2. This is in sharp contrast to the Hubbard model in a weak or intermediate coupling region, where there is no numerical evidence of superconductivity.

4 pages, 5 figures

References in corpus (12)

• Correlated Electrons in High Temperature Superconductors
• Renormalization group analysis of the 2D Hubbard model
• Superconductivity in the two-dimensional t-J model
• Pairing Correlations in the Two-Dimensional Hubbard Model
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• Phase Diagram and Pairing Symmetry of the Two-Dimensional t-J Model by a Variation Theory
• Superconductivity Near Phase Separation in Models of Correlated Electrons
• Crossover of superconducting properties and kinetic-energy gain in two-dimensional Hubbard model
• Ground State Properties of the Two-Dimensional t-J Model
• Evidence for Spin-Charge Separation in the Two-Dimensional T-J Model
• Enhancement of the d_{x^2-y^2} pairing correlation in the two-dimensional Hubbard model: a quantum Monte Carlo study
• Incipient order in the t-J model at high temperatures

Cited by in corpus (5)

• Pseudogap and high-temperature superconductivity from weak to strong coupling. Towards quantitative theory
• Numerical Linked-Cluster Algorithms. II. t-J models on the square lattice
• Broad Peak in the d_{x^2-y^2} Superconducting Correlation Length as a Function of Hole Concentration in the Two-Dimensional t-J Model
• d=3 Anisotropic and d=2 tJ Models: Phase Diagrams, Thermodynamic Properties, and Chemical Potential Shift
• Quantum Monte Carlo Study of the Quasi-One-Dimensional Superconductivity