Spin Dynamics in an Ordered Stripe Phase

  title={Spin Dynamics in an Ordered Stripe Phase},
  author={John M. Tranquada and P. Wochner and Douglas J. Buttrey},
  journal={Physical Review Letters},
Inelastic neutron scattering has been used to measure the low-energy spin excitations in the ordered charge-stripe phase of La{sub 2}NiO{sub 4+{delta}} with {delta}=0.133 . Spin-wave-like excitations disperse away from the incommensurate magnetic superlattice points with a velocity {approximately}60{percent} of that in the {delta}=0 compound. Incommensurate inelastic peaks remain well resolved up to at least twice the magnetic ordering temperature. Paramagnetic scattering from a {delta}=0.105… 
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