Phase diagram of the ferrimagnetic mixed-spin Blume-Capel model with four-spin and next-nearest neighbor interactions

[摘要] A finite cluster approximation based on a single cluster theory is developed for a ferrimagnetic mixed spin-1/2 and spin-1 Blume-Capel model with four-spin interaction J4and next-nearest neighbor couplings J'. The state equations are derived for the two-dimensional square lattice and the phase diagram is explored. We found that the system can exhibits both critical and tricritical behavior according to appropriate values of J', D and J4.

[发布机构] Laboratory of High Energy Physics and Scientific Computing, Hassan II University-Casablanca, Faculty of Sciences-Aïn Chock, B.P: 5366 Maarif, Casablanca; 20100, Morocco^1

[效力级别] 能源学 [学科分类] 材料科学（综合）

[关键词] Blume-Capel models;Finite clusters;Four-spin interactions;Nearest-neighbor coupling;Next nearest neighbor interaction;State equations;Tricritical behavior;Two dimensional square lattice