Nonlinear sigma model study of a frustrated spin ladder

Details Nonlinear sigma model study of a frustrated spin ladder Nonlinear sigma model study of a frustrated spin ladder

1999-10-15

arxiv.org/abs/cond-mat/9910247v1

J. Phys.: Condens. Matter vol.12 (2000) 959-964

Physics

Condensed Matter

Strongly Correlated Electrons

revtex 4 pages, figures embedded (psfig)

Scientific paper

10.1088/0953-8984/12/6/317

A model of two-leg spin-S ladder with two additional frustrating diagonal exchange couplings J_{D}, J_{D}' is studied within the framework of the nonlinear sigma model approach. The phase diagram has a rich structure and contains 2S gapless phase boundaries which split off the boundary to the fully saturated ferromagnetic phase when J_{D} and J_{D}' become different. For the S=1/2 case, the phase boundaries are identified as separating two topologically distinct Haldane-type phases discussed recently by Kim et al. (cond-mat/9910023).

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