48th Vietnam Conference on Theoretical Physics (VCTP48)
Hội nghị Vật lý lý thuyết Việt Nam lần thứ 48
Đà Nẵng, 31 July  3 August, 2023

ProgrammeP.41  Poster, VCTP48 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 theoryOanh 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 antiferromagnetic (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 (FMPM) phase transition is consistently revealed at a critical temperature T$_{c2}$. However, for certain AFM probability values, another antiferromagnetic to ferromagnetic (AFMFM) 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 
Institute of Physics, VAST

Center for Theoretical Physics 
Center for Computational Physics
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