Disordered ground states in a quantum frustrated spin chain with side chains
arXiv:0710.3457 · doi:10.1103/PhysRevB.77.134412
Abstract
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 consisting of an alternating array of spin-1 and spin-1/2 sites and side chains each 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.
12 pages, 13 figures (included)
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Cited by in corpus (5)
- Frustration Induced Quantum Phases in Mixed Spin Chain with Frustrated Side Chains
- Finite Temperature Properties of the Mixed Diamond Chain with Spins 1 and 1/2
- Exact degenerate ground states for the F-AF spin chain with bond alternation
- Coupled Cluster Treatment of the Alternating Bond Diamond Chain
- Scaling Property of the F-AF Spin Chain Near the Exactly Solvable Point