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

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

2007-10-18

arxiv.org/abs/0710.3457v2

Phys. Rev. B 77, 134412 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

12 pages, 13 figures (included)

Scientific paper

10.1103/PhysRevB.77.134412

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.

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