Disordered ground states in a quantum frustrated spin chain with side chains
Abstract
type:text
We study a frustrated mixed spin chain with side chains, where the spin species and the exchange interactions are spatially varied. A nonlinear sigma model method is formulated for this model, and a phase diagram with two disordered spin-gap phases is obtained for typical cases. Among them, we examine the case with a main chain, which consists of an alternating array of spin-1 and spin- = 1/2 sites, and side chains, each of which consists of a single spin-1/2 site, in great detail. Based on numerical, perturbational, and variational approaches, we propose a singlet cluster solid picture for each phase, where the ground state is expressed as a tensor product of local singlet states.
Journal
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- PHYSICAL REVIEW B
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PHYSICAL REVIEW B 77 (13), 134412-1-134412-11, 2008
American Physical Society
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Details 詳細情報について
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- CRID
- 1050845762748187008
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- NII Article ID
- 120006385746
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- ISSN
- 10980121
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- Web Site
- http://id.nii.ac.jp/1586/00013254/
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- Text Lang
- en
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- Article Type
- journal article
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- Data Source
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- IRDB
- CiNii Articles