2007/10/31 by K. Takano, Ken'ichi Takano, Kazuo Hida · 2 citations
Physics and Astronomy · #Advanced Condensed Matter Physics #Physics of Superconductivity and Magnetism #Quantum many-body systems #cond-mat.stat-mech #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.77.134412
published as Phys. Rev. B 77, 134412 (2008) · 12 pages, 13 figures (included)
openalex publication_date 2008/04/03 · arxiv created 2008/08/23 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We study a frustrated mixed spin chain with side chains, where the spin species and the exchange interactions are spatially varied. A nonlinear \ensuremathσ 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.