| Автор | S N Mitra |
| Автор | K G Chakraborty |
| Дата выпуска | 1994-11-28 |
| dc.description | This paper presents a discussion about a spin model arising out of singleand double-electron exchange processes. The Hamiltonian which consists of the usual Heisenberg exchange, biquadratic exchange and three-atom coupling is studied using the Green function equation-of-motion method within the random-phase approximation. The effects of biquadratic exchange and three-atom coupling on the magnetization curves, quadrupolar ordering and the transition temperature T<sub>C</sub> are studied. It is shown that the magnetization changes from second to first order at T<sub>C</sub> depending on the strengths of the biquadratic and three-atom coupling. It is also seen that T<sub>C</sub> becomes equal to zero at certain values of the parameters. The results are compared with those of molecular-field theory. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Heisenberg spin model with single- and double-electron exchange |
| Тип | paper |
| DOI | 10.1088/0953-8984/6/48/014 |
| Electronic ISSN | 1361-648X |
| Print ISSN | 0953-8984 |
| Журнал | Journal of Physics: Condensed Matter |
| Том | 6 |
| Первая страница | 10533 |
| Последняя страница | 10542 |
| Аффилиация | S N Mitra; Dept. of Phys., Basirhat Coll., West Bengal, India |
| Аффилиация | K G Chakraborty; Dept. of Phys., Basirhat Coll., West Bengal, India |
| Выпуск | 48 |
