Investigation of Multicritical Phenomena in ANNNI Model by Monte Carlo Methods

The anisotropic Ising model with competing interactions is investigated in wide temperature range and |1/| parameters by means of Monte Carlo methods. Static critical exponents of the magnetization, susceptibility, heat capacity, and correlation radius are calculated in the neighborhood of Lifshitz point. According to obtained results, a phase diagram is plotted, the coordinates of Lifshitz point are defined, and a character of multicritical behavior of the system is detected.