Phase diagrams in mixed spin-3/2 and spin-2 Ising system with two alternative layers within the effective-field theory

2011 ◽  
Vol 20 (6) ◽  
pp. 060507 ◽  
Author(s):  
Bayram Deviren ◽  
Yasin Polat ◽  
Mustafa Keskin
Keyword(s):  
Field Theory ◽  
Phase Diagrams ◽  
Effective Field Theory ◽  
Effective Field ◽  
Ising System ◽  
Mixed Spin

scholarly journals PHASE DIAGRAMS OF THE SPIN-1 BLUME–EMERY–GRIFFITHS MODEL IN A RANDOM TRANSVERSE FIELD

2004 ◽  
Vol 18 (31n32) ◽  
pp. 4129-4142 ◽  
Author(s):  
H. EZ-ZAHRAOUY ◽  
H. MAHBOUB ◽  
A. BENYOUSSEF ◽  
M. J. OUAZZANI
Keyword(s):  
Field Theory ◽  
Phase Diagrams ◽  
Effective Field Theory ◽  
Low Temperatures ◽  
Transverse Field ◽  
Effective Field ◽  
Long Range Order ◽  
Special Value ◽  
Tricritical Behavior ◽  
Beg Model

The effect of the random quantum transverse field Ω on the tricritical behavior of the spin-1 Blume–Emery–Griffiths (BEG) model is studied using an effective field theory. It is found that the tricritical behavior depends on both the biquadratic interaction K, single-ion anisotropy Δ and the concentration p of the disorder of Ω. Indeed, there exists a special value p1 of the probability p below which the tricritical behavior disappears. In addition, at sufficiently low temperatures, the system exhibits long-range order accompanied by the tricritical behavior below a special value p2 of the probability p.

Amorphization in an Ising nanowire

2017 ◽  
Vol 31 (11) ◽  
pp. 1750071 ◽  
Author(s):  
T. Kaneyoshi
Keyword(s):  
Field Theory ◽  
Phase Diagrams ◽  
Effective Field Theory ◽  
Critical Value ◽  
Effective Field ◽  
Total Magnetization ◽  
Ferromagnetic Nanowire ◽  
Reentrant Phenomena

The phase diagrams and magnetizations of an Ising nanowire with an amorphization are investigated by the use of the effective field theory with correlations. Some characteristic phenomena have been found in them. The reduced total magnetization falls below that of its corresponding crystalline ferromagnetic nanowire. The reentrant phenomena have been obtained, when the value of amorphization [Formula: see text] becomes larger than a critical value ([Formula: see text]).

Thermodynamic quantities and phase diagrams of spin-1 Blume–Capel bilayer Ising model

2015 ◽  
Vol 29 (20) ◽  
pp. 1550141 ◽  
Author(s):  
Ersin Kantar ◽  
Mehmet Ertaş
Keyword(s):  
Field Theory ◽  
Ising Model ◽  
Phase Diagrams ◽  
Effective Field Theory ◽  
Critical Behavior ◽  
Tricritical Point ◽  
Effective Field ◽  
Square Lattice ◽  
Thermodynamic Quantities ◽  
Hamiltonian Parameters

An effective field theory with correlations has been used to study the critical behavior of the spin-1 Blume–Capel bilayer Ising model on a square lattice. The effects of the Hamiltonian parameters on thermodynamic quantities and phase diagrams are investigated in detail. We found that the system exhibits the first and the second order transitions as well as tricritical point. Furthermore, we have observed that the change of tricritical point values depends on interaction parameters.

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