Bond-versus-site doping models for off-chain-doped Haldane-gap system Y2 Ba Ni O5
Jizhong Lou, Shaojin Qin, Zhaobin Su, Lu Yu
Abstract
Using the density matrix renormalization-group technique, we calculate the impurity energy levels for two different effective models of off-chain doping for quasi-one-dimensional Heisenberg chain compound Y2 Ba Ni O5: ferromagnetic bond doping and antiferromagnetic site spin-1/2 doping. Thresholds of the impurity strength for the appearance of localized states are found for both models. However, the ground-state and low-energy excitations for weak impurity strength are different for these two models and the difference can be detected by experiments.
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