Stability of the striped phase in the two-dimensional t-J model:: A variational Monte Carlo study

By using a variational Monte Carlo technique, stability of the striped phases is studied for the two-dimensional t-J model with the three-site term near 1/8 hole doping. It is found that both diagonally and vertically striped phases are comparable in energy with the d(x2-y2)-wave superconducting state in the small-J/t region. Hole-'filled' domain walls prefer diagonal stripes, whereas 'half-filled' domain walls vertical ones, in accordance with the situation observed in nickelates and cuprates. (C) 1999 Elsevier Science B.V. All rights reserved.