Programme

P.41 -- Poster, VCTP-48

Date: Thursday, 3 August 2023

Time: 08:30 - 10:00

Thermodynamic properties of competing magnetic interaction systems in perspective of Monte Carlo simulation and effective field theory

Oanh K.T. Nguyen (2), Phong H. Nguyen (1), Quan M. Le (1), Huy D. Nguyen (1), Niem T. Nguyen (1), Cong T. Bach (1), and Giang H. Bach (1)*

(1) Faculty of Physics, VNU University of Science, 334 Nguyen Trai, Thanh Xuan, Hanoi, Vietnam; (2) Electric Power University, 235 Hoang Quoc Viet, Hanoi, Vietnam

The competition between magnetic interactions such as ferromagnetic (FM) and anti-ferromagnetic (FM) interactions normally occurring in perovskites was employed by a disorder Ising model. By adjusting the probabilities of ferromagnetic (FM) and antiferromagnetic (AFM) interactions, denoted as p and (1 − p) respectively, and their magnitudes, we examine magnetic phase transitions by determining the thermodynamic behaviors, for example, magnetization, total energy, spin susceptibility, and specific heat, by using an effective field theory and Monte Carlo simulation. The calculations show that a ferromagnetic to paramagnetic (FM-PM) phase transition is consistently revealed at a critical temperature T$_{c2}$. However, for certain AFM probability values, another antiferromagnetic to ferromagnetic (AFM-FM) phase transition may occur at lower critical temperatures T$_{c1}$. While Monte Carlo simulations are advantageous for examining thermodynamic properties at finite temperatures, both with and without an external field, analytical calculations excel particularly in a wide range of temperatures without a field.

Presenter: Bach Huong Giang