Ising model with isotropic competing interactions in the presence of a field : a tricritical-lifshitz-point realization
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Data
1993Tipo
Abstract
We consider a spin system with competing interactions that are isotropic with respect to the axes of a cubic lattice. On the basis of an e expansion, we demonstrate that for small values of the external field H, the paramagnetic-to-modulated-phase transition remains first order. For larger fields, such a transition changes to a continuous one at a tricritical point ~ As one varies the wave vector q that is related to the modulated phase, one finds a line of such tricritical points. We remark th ...
We consider a spin system with competing interactions that are isotropic with respect to the axes of a cubic lattice. On the basis of an e expansion, we demonstrate that for small values of the external field H, the paramagnetic-to-modulated-phase transition remains first order. For larger fields, such a transition changes to a continuous one at a tricritical point ~ As one varies the wave vector q that is related to the modulated phase, one finds a line of such tricritical points. We remark that such a line must end at a Lifshitz tricritical point at qc = 0. ...
Contido em
Physical Review. E, Statistical Physics, Plasmas, Fluids and Related Interdisciplinary Topics. New York. Vol. 48, no. 3 (Sept. 1993), p. 1744-1751
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Artigos de Periódicos (40090)Ciências Exatas e da Terra (6108)
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