Influence of fluctations on spin systems with spatially isotropic competing interactions
We consider spin systems with competing interactions isotropic with respect to the axes of a cubic lattice. A renormalization-group analysis carried to second order in E=d -4 demonstrates that the criticai behavior for the para-modulated phase transition is 2m-component-like with m = 3 for a uniaxia...
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 1990 |
| País: | Brasil |
| Institución: | Universidade Federal do Rio Grande do Sul (UFRGS) |
| Repositorio: | Repositório Institucional da UFRGS |
| Idioma: | inglés |
| OAI Identifier: | oai:www.lume.ufrgs.br:10183/103597 |
| Acceso en línea: | http://hdl.handle.net/10183/103597 |
| Access Level: | acceso abierto |
| Palabra clave: | Sistemas de spin Propriedades magneticas das substancias Transformações de fase |
| Sumario: | We consider spin systems with competing interactions isotropic with respect to the axes of a cubic lattice. A renormalization-group analysis carried to second order in E=d -4 demonstrates that the criticai behavior for the para-modulated phase transition is 2m-component-like with m = 3 for a uniaxially modulated phase and m =4 for a cubically modulated phase, in the same universality class as the m-component spin model with uniaxial competing interactions. Each case may describe ditferent helical magnetic rare-earth alloys. Possible phase diagrams are proposed encompassing such compounds. |
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