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The S=2 antiferromagnetic Heisenberg open chain is analyzed with the real-space numerical renormalization-group method improved by White. The low-ly ing spectrum and the one-point function are evaluated to show the degeneracy and the boundary effect on the ground state. Generalized string correlation funct ions were calculated for θ=π and θ=π 2. The θ=π 2 string correlation is found to indicate the long-range hidden order of the ground state. These results are quite consistent with the S=2 VBS argument.
Nishiyama et al. (Wed,) studied this question.
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