%0 Journal Article
%T Spin Gap and Superconductivity in the One-Dimensional t-J Model with Coulomb Repulsion
%A M. Troyer
%A H. Tsunetsugu
%A T. M. Rice
%A J. Riera
%A E. Dagotto
%J Physics
%D 1992
%I arXiv
%R 10.1103/PhysRevB.48.4002
%X 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.
%U http://arxiv.org/abs/cond-mat/9212031v1