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| Natura: | Artículo científico |
| Lingua: | en |
| Pubblicazione: |
Sociedade Brasileira de Física
2004
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| Accesso online: | https://www.redalyc.org/articulo.oa?id=46434209 |
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Sommario:
- Compensation temperature of the mixed-spin ising model on the hexagonal lattice M. Godoy V. S. Leite W. Figueiredo Física, Astronomía y Matemáticas We studied a layered mixed-spin Ising model, with spins σ = 1/2 and S = 1, distributed on the sites of ahexagonal lattice. For this spin arrangement, any spin at one lattice site has two nearest-neigbor spins of thesame type, and four of the other type. We assumed that the exchange interaction between spins σ and S isantiferromagnetic, with the value J1. J2 is the exchange interaction between two nearest neighbor σ spins,and J3 is the coupling between two nearest neighbor S spins. We also considered a single-ion crystal-fieldcontribution D to the S sites. We performed mean-field calculations and Monte Carlo simulations to determinethe compensation point of the model. We have shown that a compensation point can be present for any positivevalue of D. We have also found a negative lower bound for D, below which a compensation point can notappear. For each value of D, we determined the range of values of the J2 and J3 couplings for which acompensation point is realizable. 2004 artículo científico 0103-9733 https://www.redalyc.org/articulo.oa?id=46434209 en http://www.redalyc.org/revista.oa?id=464 Brazilian Journal of Physics application/pdf Sociedade Brasileira de Física Brazilian Journal of Physics (Brasil) Num.2A Vol.34