| Автор | R J Vasconcelos dos Santos |
| Автор | F C Sa Barreto |
| Автор | S Coutinho |
| Дата выпуска | 1990-06-21 |
| dc.description | The re-entrant phenomenon is studied in the antiferromagnetic Ising model on a square lattice with the bonds decorated with two and three-coupled spin 1/2 variables (dimer and trimer) in two different scenarios. In the first one ferromagnetic competing decorated bonds are anneal diluted in the system. The exact phase diagrams of the critical temperature as a function of the concentration and of the competition parameter are obtained. In contrast to the single spin bond decoration, a double re-entrant behaviour is observed. The bond percolation threshold P<sub>c</sub>=(1-1/2)/2 is achieved and it is independent of the decorating variable. In the second scenario the pure axial decorated system is studied. The analytical temperature against competition parameter phase diagram and the specific heat are calculated and discussed. In this latter case multiple re-entrances are observed for a certain range of the competition parameter. The nature of this re-entrant phenomenon is discussed. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Multiple re-entrant phenomenon on decorated square lattice Ising models |
| Тип | paper |
| DOI | 10.1088/0305-4470/23/12/032 |
| Print ISSN | 0305-4470 |
| Журнал | Journal of Physics A: Mathematical and General |
| Том | 23 |
| Первая страница | 2563 |
| Последняя страница | 2573 |
| Аффилиация | R J Vasconcelos dos Santos; Dept. of Phys., Boston Univ., MA, USA |
| Аффилиация | F C Sa Barreto; Dept. of Phys., Boston Univ., MA, USA |
| Аффилиация | S Coutinho; Dept. of Phys., Boston Univ., MA, USA |
| Выпуск | 12 |
