scholarly journals Bethe lattice approach study of the mixed spin-1/2 and spin-7/2 Ising model in a longitudinal magnetic field

2018 ◽  
Vol 21 (1) ◽  
pp. 13705
Author(s):  
Eddahri ◽  
Karimou ◽  
Razouk ◽  
Hontinfinde ◽  
Benyoussef
Keyword(s):  
Magnetic Field ◽  
Ising Model ◽  
Longitudinal Magnetic Field ◽  
Bethe Lattice ◽  
Mixed Spin ◽  
Lattice Approach

Phase diagrams of the ferrimagnetic mixed spin-1/2 and spin-5/2 Ising model under a longitudinal magnetic field

2019 ◽  
Vol 94 (2) ◽  
pp. 025804 ◽  
Author(s):  
N Hachem ◽  
M Alehyane ◽  
A Lafhal ◽  
H Zahir ◽  
M Madani ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Ising Model ◽  
Phase Diagrams ◽  
Longitudinal Magnetic Field ◽  
Mixed Spin

Triple mixed-spin Ising model

2020 ◽  
Vol 34 (13) ◽  
pp. 2050129
Author(s):  
Erhan Albayrak
Keyword(s):  
Phase Transitions ◽  
Ising Model ◽  
Magnetic Fields ◽  
Exchange Interaction ◽  
Spin System ◽  
Bethe Lattice ◽  
Nearest Neighbors ◽  
Recursion Relations ◽  
Mixed Spin ◽  
Exchange Interaction Parameter

The A, B and C atoms with spin-1/2, spin-3/2 and spin-5/2 are joined together sequentially on the Bethe lattice in the form of ABCABC[Formula: see text] to simulate a molecule as a triple mixed-spin system. The spins are assumed to be interacting with only their nearest-neighbors via bilinear exchange interaction parameter in addition to crystal and external magnetic fields. The order-parameters are obtained in terms of exact recursion relations, then from the study of their thermal variations, the phase diagrams are calculated on the possible planes of our system. It is found that the model gives only second-order phase transitions in addition to the compensation temperatures.

scholarly journals Weak Singularities of the Isothermal Entropy Change as the Smoking Gun Evidence of Phase Transitions of Mixed-Spin Ising Model on a Decorated Square Lattice in Transverse Field

Entropy ◽  
2021 ◽  
Vol 23 (11) ◽  
pp. 1533
Author(s):  
Jozef Strečka ◽  
Katarína Karl’ová
Keyword(s):  
Magnetic Field ◽  
Phase Transitions ◽  
Ising Model ◽  
Magnetocaloric Effect ◽  
Entropy Change ◽  
Transverse Magnetic ◽  
Continuous Phase ◽  
Square Lattice ◽  
Mixed Spin ◽  
Weak Singularities

The magnetocaloric response of the mixed spin-1/2 and spin-S (S>1/2) Ising model on a decorated square lattice is thoroughly examined in presence of the transverse magnetic field within the generalized decoration-iteration transformation, which provides an exact mapping relation with an effective spin-1/2 Ising model on a square lattice in a zero magnetic field. Temperature dependencies of the entropy and isothermal entropy change exhibit an outstanding singular behavior in a close neighborhood of temperature-driven continuous phase transitions, which can be additionally tuned by the applied transverse magnetic field. While temperature variations of the entropy display in proximity of the critical temperature Tc a striking energy-type singularity (T−Tc)log|T−Tc|, two analogous weak singularities can be encountered in the temperature dependence of the isothermal entropy change. The basic magnetocaloric measurement of the isothermal entropy change may accordingly afford the smoking gun evidence of continuous phase transitions. It is shown that the investigated model predominantly displays the conventional magnetocaloric effect with exception of a small range of moderate temperatures, which contrarily promotes the inverse magnetocaloric effect. It turns out that the temperature range inherent to the inverse magnetocaloric effect is gradually suppressed upon increasing of the spin magnitude S.

Magnetic behavior of a mixed spin-1 and spin-72Blume–Capel model on the Bethe lattice in the presence of an applied magnetic field

2016 ◽  
Vol 90 (3) ◽  
pp. 268-288 ◽  
Author(s):  
M. Karimou ◽  
R. A. Yessoufou ◽  
F. K. Guedje ◽  
C. Aïnamon ◽  
F. Hontinfinde
Keyword(s):  
Magnetic Field ◽  
Applied Magnetic Field ◽  
Bethe Lattice ◽  
Magnetic Behavior ◽  
Mixed Spin
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