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Phase transitions in staggered spin ladders

AutorMartín-Delgado, Miguel Ángel; Shankar, R.; Sierra, Germán
Palabras clave[PACS] Quantized spin models
[PACS] Antiferromagnetics
[PACS] Spin waves
Fecha de publicación1996
EditorAmerican Physical Society
CitaciónPhysical Review Letters 77: 3443- 3446 (1996)
ResumenWe map spin ladders with nl legs and couplings J' across all rungs and 7(1 ± γ) along the legs, staggered in both directions, to a sigma model. Setting its θ = (2m + 1)π (where it is known to be gapless), we locate the critical curves in the γ versus J'/J plane at each nl, and spin S. The phase diagram is rich and has some surprises: When two gapped chains are suitably coupled, the combination becomes gapless. With nl, γ, and J'/J to control, the prospects for experimentally observing any one of these equivalent transitions are enhanced. We interpret our results in the framework of the resonating valence bond description of ladders. © 1996 The American Physical Society
Identificadoresdoi: 10.1103/PhysRevLett.77.3443
issn: 0031-9007
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