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Phase behavior of a family of continuous two-dimensional -vector models with , 3, and 4
Phys. Rev. E 76, 061107 – Published 6 December, 2007
DOI: https://doi.org/10.1103/PhysRevE.76.061107
Abstract
In this work we investigate the phase behavior of a family of continuous bidimensional -vector models (with , 3, and 4) using Monte Carlo simulation. In all cases we detect the presence of a defect mediated order-disorder transition of the Berezinskii-Kosterlitz-Thouless type with critical temperatures that decrease with the spin dimensionality. Coupled with the order-disorder transition a gas-liquid equilibrium is found at low temperatures. Here one observes that the stability region of the liquid phase shrinks with the growing spin dimensionality, in parallel with a decrease in magnitude of the angular averaged spin-spin interaction.
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