Fizika Nizkikh Temperatur: Volume 46, Number 10 (October 2020), p. 1200-1205 ( to contents , go back )
Critical properties of the antiferromagnetic decorated Ising model on a square lattice
V. A. Mutailamov and A. K. Murtazaev
Amirkhanov Institute of Physics of Daghestan Scientific Center of RAS 94 Yaragskovo Str., Makhachkala 367003, Russia
Received March 23, 2020, revised June 19,2020, published online August 21, 2020
Using the methods of computational physics, the static critical behavior of a two-dimensional decorated Ising model on a square lattice in an external magnetic field is investigated. A special case is considered when the exchange antiferromagnetic interaction is present only between decorated spins and spins located at lattice sites. It is shown that, when the external magnetic field is H0 = 4, the model undergoes partial degeneracy in the ground state. At values of the field close to H0 = 4, the effect of splitting of the specific heat is observed.
Key words: Ising model, frustrations, decorated lattice, numerical simulation.