| Автор | D F McMorrow |
| Автор | M A H McCausland |
| Автор | Z -P Han |
| Автор | J S Abell |
| Дата выпуска | 1989-12-25 |
| dc.description | The hyperfine splitting of holmium, as a dilute (1%) substituent in ferromagnetic GdAl<sub>2</sub> has been studied by spin-echo NMR at liquid helium temperatures. The measurements were made on oriented single crystals, with fields up to 8 T applied along twofold, threefold and fourfold crystallographic symmetry axes. The field dependence of the hyperfine splitting is interpreted in terms of the standard three-parameter mean-field model for lanthanide ions at sites of cubic symmetry. The crystal-field coefficients are found to be 30% to 40% smaller than those for pure HoAl<sub>2</sub>; moreover, the molecular field seen by the holmium ion is more than 20% below the lower bound derived from a current model of exchange in RAl<sub>2</sub> compounds. These unexpected results are strikingly confirmed by a recent analysis of FMR data on a dilute Ho:GdAl<sub>2</sub> alloy. Possible explanations are considered. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Exchange and crystal-field interactions of Ho<sup>3+</sup> in GdAl<sub>2</sub>: a single-crystal NMR study |
| Тип | paper |
| DOI | 10.1088/0953-8984/1/51/016 |
| Electronic ISSN | 1361-648X |
| Print ISSN | 0953-8984 |
| Журнал | Journal of Physics: Condensed Matter |
| Том | 1 |
| Первая страница | 10439 |
| Последняя страница | 10458 |
| Аффилиация | D F McMorrow; Schuster Lab., Manchester Univ., UK |
| Аффилиация | M A H McCausland; Schuster Lab., Manchester Univ., UK |
| Аффилиация | Z -P Han; Schuster Lab., Manchester Univ., UK |
| Аффилиация | J S Abell; Schuster Lab., Manchester Univ., UK |
| Выпуск | 51 |
