Specific Features of Phase States of a Diluted 2D Magnet with Frustration

Abstract

Abstract: The properties of a dilute Ising magnet are studied using a two-dimensional spin–pseudospin model with charged impurities and a frustration caused by the competition of the charge and magnetic orderings. Based on the classical Monte Carlo method, the ground state phase diagram has been obtained and also unusual phase states appeared at finite temperatures have been studied. The regions in which order–order phase transitions and also reentrant phase transition are observed have been found. © 2020, Pleiades Publishing, Ltd.This work was supported by the program of enhancing the competitiveness of the Ural Federal University (Act 211 of the Government of the Russian Federation, Agreement no. 02.A03.21.0006), the Ministry of Education and Science of the Russian Federation (project FEUZ-2020-0054, and also the Russian Foundation for Basic Research (project no. 18-32-00837\18)