Physics NotePublished
Anisotropic Heisenberg Interface between Ising Bulk Ferromagnets: a Renormalization Group Approach
R.J.V. dos Santos; E. F. Sarmento; C. Tsallis
1985
Publication details
- Authors
- R.J.V. dos Santos; E. F. Sarmento; C. Tsallis
- Type
- Physics Note
- Status
- Published
- Publication date
- 1985
- Description
- We consider two semi-infinite spin 1/2 Ising media (respectively characterized by the ferromagnetic coupling constants <math>J_1\,\!</math> and <math>J_2\,\!</math> )separated by a spin 1 /2 anisotropic Heisenberg interface (characterized by a ferromagnetic coupling constant <math>J_S\,\!</math>, and by an anisotropy <math>\eta\,\!</math> <math> \epsilon [0,1] \,\!</math> in spin space; <math>\eta =1 \,\!</math> and <math>\eta =0 \,\!</math> respectively correspond to the Ising and isotropic Heisenberg limits). Within a real-space renormalization-group framework, we discuss the full phase diagram; this diagram exhibits, besides the paramagnetic phase, three physically different ordered phases, namely the double-bulk, single-bulk and surface ferromagnetic ones. We also analyze the various universality classes appearing in this problem, and determine, in particular, the existence of a new high-order multicritical point associated with the <math>J_1\,\!</math> = <math>J_2\,\!</math> case.
- Year
- 1985
- Number
- CBPF-NF-028/85
- Linked to a thesis
- No
- Linked to a grant
- No