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[en] Theoretically, the magnetic behaviours and the magneto-caloric performance of the Pb2CoUO6 double perovskite were predicted and examined. The results attained in this paper showed that the Pb2CoUO6 double perovskite was a ferromagnetic state under Tc ~ 10 K. The order magnetic transition of this system was a second-order from the ferromagnetic (FM) to the paramagnetic (PM) transition above Tc. The Pb2CoUO6 double perovskite was a hard magnetic material. Additionally, other physical quantities were determined and examined; namely, the magnetic entropy change (-ΔSM) and the relative cooling power (RCP), which were 4.38 J kg-1 K-1 and 25.47 J kg-1, respectively, at the applied magnetic field of 4 T. All these physical quantities were examined using the Monte Carlo approach (MCA). (author)
[en] Being motivated by Dendrimer model with mixed spins σ=3 and S=7/2, we investigated the magnetic nanoparticle system in this study. We analyzed and discussed the ground-state phase diagrams and the stable phases. Then, we elaborated and explained the magnetic properties of the system by using Monte Carlo Simulations (MCS) in the framework of the Ising model. In this way, we determined the blocking temperature, which is deduced through studying the partial-total magnetization and susceptibility as a function of the temperature, and we established the effects of both the exchange coupling interaction and the crystal field on the hysteresis loop.
[en] We discuss the fundamental transparent conducting properties of halogens doped SnO2 rutile systems include the structural, electronic structure, optical and electrical properties. Within this study, we employ the first-principles calculation of the full potential linearized augmented plane wave (FP-LAPW) method based on the density function theory and semiclassical Boltzmann equations. It is found that the halogens substitutional doping cause an expansion of SnO2 lattice constants and low thermodynamic perturbation. The dopants act as shallow donors by creating impurity states at the bottom of the conduction band that lead to blue-shift in the optical transparency. Moreover, the electrical conductivity of SnO2 Rutile is significantly improving by halogens doping. In fact, these results could stimulate the future experimental works for elaborating new generations of the transparent conducting oxides in an optimal way.