Abstract
Neutron scattering experiments on La2−xSrxCuO4 (LSCO) have revealed the incommensurate antiferromagnetic peaks do not lie exactly on the symmetry axes (qx=±π and qy=±π), but, are slightly shifted from them. In this paper, a scenario is presented for such ‘shift’ in terms of the anisotropy of t′ (next-nearest-neighbor hopping integral on the square lattice) in the slave-boson scheme of the two-dimensional t-J model. Since the predictions of the present theory are different from those based on the ‘spin-charge stripes’ hypothesis, further studies of the ‘shift’ may clarify the factor responsible for the incommensurate antifcrromagnetic fluctuations in LSCO systems.
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