Internal localized eigenmodes on spin discrete breathers in   antiferromagnetic chains with on-site easy axis anisotropy
  We investigate internal localized eigenmodes of the linearized equation around spin discrete breathers in 1D antiferromagnets with on-site easy axis anisotropy. The threshold of occurrence of the internal localized eigenmodes has a typical structure in parameter space depending on the frequency of the spin discrete breather. We also performed molecular dynamics simulation in order to show the validity of our linear analysis. 
Sang Wook Kim and Seunghwan Kim