Disordered ground states in a quantum frustrated spin chain with side chains

• Takano, Ken

• 飛田, 和男

抄録

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.

収録刊行物

• PHYSICAL REVIEW B

  PHYSICAL REVIEW B 77 (13), 134412-1-134412-11, 2008

  American Physical Society

詳細情報

• CRID: 1050845762748187008
• NII論文ID: 120006385746
• ISSN: 10980121
• Web Site: http://id.nii.ac.jp/1586/00013254/
• 本文言語コード: en
• 資料種別: journal article
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