  For La_(1 2/3)Sr_(1/3)NiO_4 -- a commensurately doped Mott-Hubbard system --
charge- and spin-ordering in a stripe phase has been investigated by phononic
and magnetic Raman scattering. Formation of a superlattice and an opening of a
pseudo-gap in the electron-hole excitation spectra as well as two types of
double-spin excitations -- within the antiferromagnetic domain and across the
domain wall -- are observed below the charge-ordering transition. The
temperature dependence suggests that the spin ordering is driven by charge
ordering and that fluctuating stripes persist above the ordering transition.
