Stripes and spin incommensurabilities are favored by lattice anisotropies - art. no. 167005

Structural distortions in cuprate materials give a natural origin for aniso tropies in electron properties. We study a modified one-band t-J model in w hich we allow for different hoppings and antiferromagnetic couplings in the two spatial directions (t(x) not equal t(y) and J(x) not equal J(y)). Inco mmensurate peaks in the spin structure factor show up only in the presence of a lattice anisotropy, whereas charge correlations, indicating enhanced f luctuations at incommensurate wave vectors, are present but almost unaffect ed with respect to the isotropic case.