Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2006-11-26
Physica A: Vol 387/12, 2777 (2008)
Physics
Condensed Matter
Disordered Systems and Neural Networks
19 pages, 11 figures; content changed
Scientific paper
10.1016/j.physa.2008.01.071
We consider an Ising competitive model defined over a triangular Husimi tree where loops, responsible for an explicit frustration, are even allowed. After a critical analysis of the phase diagram, in which a ``gas of non interacting dimers (or spin liquid) - ferro or antiferromagnetic ordered state'' transition is recognized in the frustrated regions, we introduce the disorder for studying the spin glass version of the model: the triangular +/- J model. We find out that, for any finite value of the averaged couplings, the model exhibits always a phase transition, even in the frustrated regions, where the transition turns out to be a glassy transition. The analysis of the random model is done by applying a recently proposed method which allows to derive the upper phase boundary of a random model through a mapping with a corresponding non random one.
Mendes Jose Fernando F.
Mukhamedov Farrukh
Ostilli Massimo
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