Field-Induced gap due to four-spin exchange in a spin ladder
arXiv:cond-mat/0106584 · doi:10.1088/0953-8984/13/33/321
Abstract
The effect of the four-spin cyclic exchange interaction at each plaquette in the two-leg spin ladder is investigated at T=0, especially focusing on the field-induced gap. The strong rung coupling approximation suggests that it yields a plateau at half of the saturation moment () in the magnetization curve, which corresponds to a field-induced spin gap with a spontaneous breaking of the translational symmetry. A precise phase diagram at is also presented based on the level spectroscopy analysis of the numerical data obtained by Lanczos method. The boundary between the gapless and plateau phases is confirmed to be of the Kosterlitz-Thouless (KT) universality class.
10 pages, 3 eps figures (embedded), to be published in J. Phys.: Cond. Matter
References in corpus (2)
Cited by in corpus (12)
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