Open AccessОсобенности конкуренции спиновой и псевдоспиновой подсистем в модельном купрате
Author(s) -
Юрий Демьянович Панов,
Василий Анатольевич Улитко,
Константин Сергеевич Будрин,
Дарья Николаевна Ясинская,
Александр Алексеевич Чиков
Publication year - 2019
Publication title -
fizika tverdogo tela
Language(s) - English
Resource type - Journals
eISSN - 1726-7498
pISSN - 0367-3294
DOI - 10.21883/ftt.2019.05.47574.03f
Subject(s) - antiferromagnetism , condensed matter physics , physics , ising model , cuprate , magnetic field , charge (physics) , christian ministry , spin (aerodynamics) , russian federation , phase (matter) , monte carlo method , quantum mechanics , doping , thermodynamics , political science , mathematics , statistics , economic policy , law , business
We consider the competition of magnetic and charge ordering in model cuprate within the framework of the simplified static 2D spin-pseudospin model. This model is equivalent to the 2D dilute antiferromagnetic (AFM) Ising model with charged impurities. We present the mean-field results for the system under study and make a brief comparison with classicalMonte Carlo (MC) calculations. Numerical simulations show that the cases of strong exchange and strong charge correlation differ qualitatively. For a strong exchange, the AFM phase is unstable with respect to the phase separation (PS) into the pseudospin (charge) and magnetic (spin) subsystems, which behave like immiscible quantum liquids. An analytical expression was obtained for the PS temperature.The research was supported by the Government of the Russian Federation, Program 02.A03.21.0006 and by the Ministry of Education and Science of the Russian Federation, projects Nos. 2277 and 5719, and RFBR N 18-32-0083718.