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Bond-versus-site doping models for off-chain-doped Haldane-gap system Y$_2$ Ba Ni O$_5$ | | Jizhong Lou
; Shaojin Qin
; Zhaobin Su
; Lu Yu
; | | Date: |
6 Nov 1998 | | Journal: | Phys. Rev. B, 58 (1998), 12672-12675 | | Subject: | Strongly Correlated Electrons | cond-mat.str-el | | 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 Y$_2$ Ba Ni O$_5$: 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. | | Source: | arXiv, cond-mat/9811084 | | Services: | Forum | Review | PDF | Favorites | |
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