Event Information
Monte Carlo Study of Modulated Phases by Thermodynamic Integration
- Abstract:
We report the study of microphase separation in systems with short-range attractive and long-range repulsive (SALR) interaction potentials. A Monte Carlo (MC) method based on thermodynamic integration is developed in order to calculate the free energy of modulated phases. Two models are investigated using this method. For the axial next-nearest neighbor Ising (ANNNI) model, we determine the temperature--frustration phase diagram, the equilibrium structure factor S(q) and the devil's staircase. Comparison with previous work and finite-size analysis are used to determine the accuracy of our method. The order-disorder transition is qualitatively different from a continuous transition and a typical first order transition. For the lattice-gas Yukawa model, lamellar and cylinder phases are studied. The order-disorder transition is clearly first order.
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