Stripes and superconducting pairing in the t-J model with Coulomb   interactions
  We study the competition between long- and short-range interactions among charge carriers in strongly-correlated electronic systems employing a new method which combines the density-matrix renormalization-group technique with a self-consistent treatment of the long-range interactions.   We apply the method to an extended t-J model which exhibits ``stripe'' order. The Coulomb interactions, while not destroying stripes, induce large transverse stripe fluctuations with associated charge delocalization. This leads to a substantial Coulomb-repulsion-induced {\it enhancement} of long-range superconducting pair-field correlations. 
E. Arrigoni, A. P. Harju, W. Hanke, and B. Brendel (ITP Wuerzburg),   S.A. Kivelson (UCLA)