Shift of incommensurate antiferromagnetic peaks inLa2−xSrxCuO4

Neutron scattering experiments on ${\mathrm{La}}_{2-x}{\mathrm{Sr}}_x{\mathrm{CuO}}_4$ (LSCO) have revealed that the incommensurate antiferromagnetic peaks do not lie exactly on the symmetry axes ${(q}_x=\pm \pi$ or $q_y=\pm \pi ),$ but are slightly shifted from them. In this paper, a scenario for such a “shift” is presented in terms of the anisotropy of $t^{\prime }$ (diagonal hopping integral on the square lattice) in the slave-boson scheme of the two-dimensional $t-J$ model. The predictions of the present theory based on fermiology are found to be different from those based on the “spin-charge stripes” hypothesis. This difference will serve to clarify a factor responsible for incommensurate antiferromagnetic correlations in LSCO systems.