| Автор | K W H Stevens |
| Автор | F Mehran |
| Дата выпуска | 1987-12-10 |
| dc.description | A theory of spin-resonance lineshapes in random magnetic compounds is developed and applied to the insulating Heisenberg system Eu<sub>x</sub>Sr<sub>1-x</sub>S. The magnetic dipolar interaction is treated as a perturbation on the unperturbed Hamiltonian consisting of exchange and Zeeman interactions. The formulae for the first and second moments of the lineshape (related respectively to lineshifts and broadenings) are derived to second order in perturbation. The general formulae are particularly appropriate for low-temperature approximations where the most interesting experimental features occur in the spin-glass and the re-entrant regimes. Although a quantitative comparison between theory and experiment is not possible as the problem of random Heisenberg systems is unsolved, the theory qualitatively accounts for the experimental trends in the paramagnetic region. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Theory of spin-resonance lineshapes in Eu<sub>x</sub>Sr<sub>1-x</sub>S |
| Тип | paper |
| DOI | 10.1088/0022-3719/20/34/014 |
| Print ISSN | 0022-3719 |
| Журнал | Journal of Physics C: Solid State Physics |
| Том | 20 |
| Первая страница | 5773 |
| Последняя страница | 5789 |
| Аффилиация | K W H Stevens; Dept. of Phys., Nottingham Univ., UK |
| Аффилиация | F Mehran; Dept. of Phys., Nottingham Univ., UK |
| Выпуск | 34 |
