Low energy, quasi-one-dimensional, spin dynamics in charge-ordered   La(2-x)Sr(x)NiO(4)
  The low energy spin excitations of La(2-x)Sr(x)NiO(4), x = 0.275 and 1/3, have been investigated by unpolarized- and polarized-inelastic neutron scattering from single crystals. A pattern of magnetic diffuse scattering is observed in both compositions, and is consistent with quasi-one-dimensional AFM spin correlations along the charge stripes. Analysis of the energy lineshape for x = 1/3 indicates that the diffuse scattering is inelastic with a characteristic energy of 1.40 +/- 0.07 meV. There is no discernible difference between the diffuse scattering from x = 0.275 and x = 1/3, suggesting that it is an intrinsic property of the charge stripes. 
P. G. Freeman, D. Prabhakaran, K. Nakajima, A. Stunault, M. Enderle,   C. Niedermayer, C. Niedermayer, K. Yamada and A. T. B...
cond-mat.str-el