Spin-3/2 Ising model AFM/AFM two-layer lattice with crystal field |
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| Authors: | Erhan Albayrak and Ali Yigit |
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| Affiliation: | Department of Physics, Erciyes University, 38039, Kayseri, Turkey |
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| Abstract: | The spin-3/2 Ising model is investigated for the case of
antiferromagnetic (AFM/AFM) interactions on the two-layer Bethe
lattice by using the exact recursion relations in the pairwise
approach for given coordination numbers q=3, 4 and 6 when the
layers are under the influences of equal external magnetic and equal
crystal fields. The ground state (GS) phase diagrams are obtained on
the different planes in detail and then the temperature-dependent
phase diagrams of the system are calculated accordingly. It is
observed that the system presents both second- and first-order phase
transitions for all q, therefore, tricritical points. It is also
found that the system exhibits double-critical end points and
isolated points. The model also presents two Néel temperatures,
TN, and the existence of which leads to the reentrant
behaviour. |
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| Keywords: | Bethe lattice spin ground
state AFM/AFM layer phase |
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