Computer simulation of the critical behavior of magnetic systems with competition between the short- and long-range interactions

作者：Belim S V^*; Larionov I B; Soloneckiy R V

来源：Physics of Metals and Metallography, 2016, 117(11): 1079-1084.

DOI：10.1134/S0031918X1611003X

• Ising model
• critical phenomena
• effects of long-range interaction

Critical behavior of Ising ferromagnetic systems with the competition between short- and long-range interactions near the point of a second-order phase transition has been investigated. The effects of long-range interaction lead to the need to calculate the influence of next-nearest spins, which lie inside the sphere of a specific radius. The study was carried out for a power law of decreaseing the exchange integral with distance for a three-dimensional Ising model with a cubic lattice. A comparison with the results of a field-theoretical approach and data of real experiments has been carried out. It has been shown that the critical temperature grows linearly with an increase in the parameters of long-range interaction. Critical exponents have been calculated at different parameters of long-range interaction. It is shown that at small dimensions of a system it is the short-range interaction that exerts the dominant effect on the critical behavior of the system. With an increase in the linear dimension of the system, long-range forces begin to dominate.

• 出版日期2016-11