Open AccessПроявление фрустраций основного состояния двумерной разбавленной модели Изинга в магнитокалорическом эффекте
Author(s) -
А.В. Шадрин,
В.А. Улитко,
Ю.Д. Панов
Publication year - 2020
Publication title -
fizika tverdogo tela
Language(s) - English
Resource type - Journals
eISSN - 1726-7498
pISSN - 0367-3294
DOI - 10.21883/ftt.2020.09.49785.32h
Subject(s) - ferromagnetism , magnetic refrigeration , ground state , condensed matter physics , ising model , monte carlo method , frustration , impurity , paramagnetism , exchange interaction , physics , residual entropy , statistical physics , magnetic field , configuration entropy , magnetization , quantum mechanics , mathematics , statistics
The magnetocaloric effect is considered in the 2D dilute Ising model for various ratios of the parameters of inter-site repulsion of nonmagnetic impurities and exchange interaction. Numerical simulations using the classical Monte Carlo method on a square lattice shows that in the case of weak exchange at sufficiently high concentrations of nonmagnetic impurities, long-range ferromagnetic ordering is destroyed with the formation of isolated spin clusters in the ground state of the system. This leads to the appearance of a paramagnetic response of the system at zero temperature and a nonzero entropy of the ground state. In the paper, we discuss the possibility of detecting the frustration of the ground state using data on changes in magnetic entropy.