Spin Gap and Superconductivity in the One-Dimensional t-J Model with Coulomb Repulsion

Details Spin Gap and Superconductivity in the One-Dimensional t-J Model with Coulomb Repulsion Spin Gap and Superconductivity in the One-Dimensional t-J Model with Coulomb Repulsion

1992-12-23

arxiv.org/abs/cond-mat/9212031v1

Phys. Rev. B 48, 004002 (1993)

Physics

Condensed Matter

26 pages (RevTeX), 10 figures available upon request as PostScript file or hardcopy, IPS-Report Nr. 93/01

Scientific paper

10.1103/PhysRevB.48.4002

The one-dimensional t-J model with density-density repulsive interactions is investigated using exact diagonalization and quantum Monte Carlo methods. A short-range repulsion pushes phase separation to larger values of J/t, and leads to a widened precursor region in which a spin gap and strengthened superconducting correlations appear. The correlation exponent is calculated. On the contrary, a long-range repulsion of $1/r$-form suppresses superconductivity in the precursor region.

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