Phase transitions in staggered spin ladders
We 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...
| Autores: | , , |
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| Formato: | artículo |
| Fecha de publicación: | 1996 |
| País: | España |
| Recursos: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/102696 |
| Acesso em linha: | http://hdl.handle.net/10261/102696 |
| Access Level: | acceso abierto |
| Palavra-chave: | [PACS] Quantized spin models [PACS] Antiferromagnetics [PACS] Spin waves |
| Resumo: | We 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 |
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