Within the time-dependent Gutzwiller approximation for the Hubbard model we compute the magnetic fluctuations of vertical metallic stripes with parameters appropriate for La1.875Ba0.125CuO4 (LBCO). For bond- and site-centered stripes the excitation spectra are similar, consisting of a low-energy incommensurate acoustic branch which merges into a ``resonance peak'' at the antiferromagnetic wave vector and several high-energy optical branches. The acoustic branch is similar to the result of theories assuming localized spins whereas the optical branches are significantly different. Results are in good agreement with a recent inelastic neutron study of LBCO.
@article{arxiv.cond-mat/0406589,
title = {Magnetic fluctuations from stripes in cuprates},
author = {G. Seibold and J. Lorenzana},
journal= {arXiv preprint arXiv:cond-mat/0406589},
year = {2009}
}