2005/05/15 by Takashi Koretsune, Masao Ogata
Materials Science · Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #Organic and Molecular Conductors Research #Physics of Superconductivity and Magnetism #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1143/jpsj.74.1390
published as J. Phys. Soc. Japan 74, 1390 (2005) · 4 pages, 5 figures
openalex publication_date 2005/05/15 · arxiv created 2005/05/25 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
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 ≃ 0.2 t. By comparison of single-particle contributions in the correlation functions, we find an effective attractive interaction between quasi-particles in dx2-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.