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

Takashi Koretsune, Masao Ogata

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

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 languageEnglish
Pages (from-to)1390-1393
Number of pages4
Journaljournal of the physical society of japan
Volume74
Issue number5
DOIs
Publication statusPublished - 2005 May
Externally publishedYes

Keywords

  • Superconductivity
  • t-J model

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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