Open AccessОсобенности вырождения основного состояния спин-псевдоспиновой модели двумерного магнетика вблизи точки фрустрации
Author(s) -
Д.Н. Ясинская,
В.А. Улитко,
Ю.Д. Панов
Publication year - 2021
Publication title -
fizika tverdogo tela
Language(s) - English
Resource type - Journals
eISSN - 1726-7498
pISSN - 0367-3294
DOI - 10.21883/ftt.2021.09.51311.05h
Subject(s) - frustration , ground state , degeneracy (biology) , ising model , physics , monte carlo method , phase transition , spin (aerodynamics) , condensed matter physics , statistical physics , geometrical frustration , charge ordering , charge (physics) , quantum mechanics , mathematics , statistics , bioinformatics , biology , thermodynamics
The classical Monte Carlo method is used for the study of properties of the ground state and phase transitions of the spin-pseudospin model describing a two-dimensional Ising magnet with competing charge and spin interactions. This competition causes ground state degeneracy and frustration. It is shown that the ground state degeneracy is observed in the frustration area with nonzero probabilities of the formation of two different ordered states. Based on histogram analysis of Monte-Carlo data, the type of phase transitions is analyzed. It is found that first order phase transitions are observed near the frustration point, depending on the relationship between the spin s = 1/2 and pseudospin S = 1 interactions.