Phase diagrams of spin ladders with ferromagnetic legs
arXiv:cond-mat/0209677 · doi:10.1103/PhysRevB.67.064419
Abstract
The low-temperature properties of the spin S=1/2 ladder with anisotropic ferromagnetic legs are studied using the continuum limit bosonization approach. The weak-coupling ground state phase diagram of the model is obtained for a wide range of coupling constants and several unconventional gapless ''spin-liquid'' phases are shown to exist for ferromagnetic coupling. The behavior of the ladder system in the vicinity of the ferromagnetic instability point is discussed in detail.
11 pages, 4 figures