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 ≃ 0.2t. By comparison of single-particle contributions in the correlation functions, we find an effective attractive interaction between quasi-particles in d x2-y2-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.
Original language | English |
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Pages (from-to) | 1390-1393 |
Number of pages | 4 |
Journal | journal of the physical society of japan |
Volume | 74 |
Issue number | 5 |
DOIs | |
Publication status | Published - 2005 May |
Externally published | Yes |
Keywords
- Superconductivity
- t-J model
ASJC Scopus subject areas
- Physics and Astronomy(all)