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Título: | Magnetic behavior of a ferroferrimagnetic ternary alloy ABρC1−ρ with a selective site disorder: Case study of a mixed-spin Ising model on a honeycomb lattice |
Palavras-chave: | Critical phenomena Magnetic order Phase transitions Ising model Ferromagnetismo e ferrimagnetismo Ordem magnética Transições de fase Modelo de Ising |
Data do documento: | Mar-2020 |
Editor: | American Physical Society |
Citação: | TORRICO, J. et al. Magnetic behavior of a ferroferrimagnetic ternary alloy ABρC1−ρ with a selective site disorder: Case study of a mixed-spin Ising model on a honeycomb lattice. Physical Review E, [S. I.], v. 101, n. 3, 032104, Mar. 2020. DOI: 10.1103/PhysRevE.101.032104. |
Resumo: | Phase transitions, compensation phenomenon, and magnetization of a ferroferrimagnetic ternary alloy A B ρ C 1 − ρ composed of three different kinds of magnetic ions A , B , and C with the spin magnitudes 1/2, 1, and 3/2 are examined within the framework of a mixed-spin Ising model on a honeycomb lattice with a selective annealed site disorder on one of its two sublattices. It is supposed that the first sublattice of a bipartite honeycomb lattice is formed by the spin-1/2 magnetic ions, while the sites of the second sublattice are randomly occupied either by the spin-1 magnetic ions with a probability ρ or the spin-3/2 magnetic ions with a probability 1 − ρ , both being subject to a uniaxial single-ion anisotropy. The model under investigation can be exactly mapped into an effective spin-1/2 Ising model on a triangular lattice through the generalized star-triangle transformation. For a specific concentration of the spin-1 (spin-3/2) magnetic ions, it is shown that the ferroferrimagnetic version of the studied model may display a compensation temperature at which the total magnetization vanishes below a critical temperature. The critical temperature strikingly may also become independent of the concentration of the randomly mixed spin-1 and spin-3/2 magnetic ions for a specific value of a uniaxial single-ion anisotropy. The spontaneous magnetic order may be notably restored at finite temperatures through the order-by-disorder mechanism above a disordered ground state, which results in an anomalous temperature dependence of the total magnetization with double reentrant phase transitions. |
URI: | https://journals.aps.org/pre/abstract/10.1103/PhysRevE.101.032104 http://repositorio.ufla.br/jspui/handle/1/43444 |
Aparece nas coleções: | DFI - Artigos publicados em periódicos |
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