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We investigate internal localized eigenmodes of the linearized equationaround spin discrete breathers in 1D antiferromagnets with on-site easy axisanisotropy. The threshold of occurrence of the internal localized eigenmodeshas a typical structure in parameter space depending on the frequency of thespin discrete breather. We also performed molecular dynamics simulation inorder to show the validity of our linear analysis.Comment: 4 pages including 5 figure

Internal localized eigenmodes on spin discrete breathers in antiferromagnetic chains with on-site easy-axis anisotropy