Magnetoelasticidade e comportamento crítlco em cadeias de ising
DOI:
https://doi.org/10.5433/1679-0375.1989v10n4p262Keywords:
Ising model, Elastic vibrations, Effective spin Hamiltonian, Pressure ensemble, Short-range interactions, First-order phase transitions, Long-range interactions.Abstract
We consider two distinct ways of introducing elastic degrees of freedom in the one-dimensional Ising model. Taking into account the average effect of elastic vibrations, the effective spin Hamiltonian in the pressure ensemble diplays long-rang interactions which give rise to a first-order phase transition. However, local fluctuation of the crystalline positions lead to an effective spin Hamiltonian with short-range interactions and without any thermodynamic anomaly in one dimension.
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