Magnetic properties and phase diagrams of mixed spin-1 and spin-1/2 Ising model on a checkerboard square structure: A Monte Carlo study

[摘要] The magnetic properties and phase diagrams of the mixed spin-1 and spin-1/2 Ising model on a checkerboard square structure have been studied using the Monte Carlo simulations based on the Metropolis update protocol. The system consists of four quartets of alternative spin configurations. We found that the compensation temperature evolves for J1 0.6 of the spin-1 assembly and J2 1.6 of spin-1/2. Regarding the crystal field strength, a threshold value of D > -0.8 has been observed. We obtain the N-, Q- and P-type compensation behaviors in the system. The phase diagrams exhibit a second-order phase transition to a paramagnetic phase for small values of|D|; hence, the system does not show the tricritical point. However, for large negative values of Da first-order phase transition occurs at the threshold value ofJ1. The magnetic hysteresis cycles have been obtained for different values of the exchange interaction, temperature, and crystal field. Finally, the system exhibits the superparamagnetic behavior for a fixed value of the temperature and crystal field.

[发布日期] 2021-12-15

[关键词] 2D-lattice;Monte Carlo simulation;Ising model;Compensation temperature;Magnetic properties;Phase diagrams;Hysteresis loops;Crystal field