Monte Carlo studies of critical phenomena in mixed spin-3/2 and spin-5/2 Ising model on square lattice

摘要: We used a Monte Carlo simulation to analize the magnetic behavior of Ising model mixed spins S A = §3=2;§1=2 and ae B §5=2;§3=2;§1=2, on square lattice. Were studied possible critical phenomena that may emerge in region around multiphase point (D=jJ1j i3;J2=jJ1j 1) dependence phase diagrams with intensities anisotropy field single ion (D=jJ1j) ferromagnetic coupling exchange spin i (J2=jJ1j). The system displays first order transitions certain range parameters Hamiltonian, which depend D=jJ1j jJ2=jJ1j. In plane (D=jJ1j;kBT=jJ1j), decrease jD=jJ1jj, implies temperature, Tc, increases transition Tt, decreases. (J2=jJ1j;kBT=jJ1j), Tc increasing J2=jJ1j, while Tt